Top 10 Countries Of The Modern World That It’s Impossible To Invade


War is something that nobody would like to happen in the world (at least should be like that). Only people who never experienced it firsthand or people who survive a war and see the horrible consequences maybe would think that such a thing is cool to look forward for.

War is “hell”, pure and simple. Because of this statement is a fact, most countries in the world invest a lot in the military equipment, army and technology to be prepared, unwilling to be taken unawares by a military attack or invasion.

On the list below you will see 10 countries that are definitely prepared for any military action and its almost impossible to invade. The rankings are not make by the country firepower and military active personnel only, but also by the geographical and topographic position and the terrain.



Active Personnel: 6,000

Bhutan is the only continental and landlocked country among these four, located high up in the Himalayas. Though sandwiched between India and China, Bhutan is one of the most secluded nations in the world, and the happiest. It has also kept itself out of any foreign entanglements since it joined the UN in 1971. The country has no diplomatic relations with the US, and only Bangladesh and India have embassies in Bhutan.

Nowadays the invasion will be impossible cause of two main reasons. First, is the terrain. Hiking your way 3000 meters above sea level to Bhutan can cause altitude sickness and tanks would have no chance of making the trip.

And the second is that India decide to take the small country under its protection by supplying them weapons, money and training to Bhutan’s minor army. It has also promised to use army of 1.200.000 people to protect the nation.

9. Switzerland

Switzerland Flag

Active Personnel: 100,000, Reserve: 77,000
Tanks: 224, Artillery: 224
Air Fighters: 63, Helicopters: 43

Pretty much everyone is aware by now of Switzerland’s famous neutrality. As Europe was plunged in two World Wars, the Alpine country was spared from the terrific onslaught. Given its mountainous location, the country devised a defensive plan, known as the Swiss National Redoubt, which was deployed as early the 1880s. The plan involved building a series of fortresses and strongholds in key locations around the many mountain passes.

After WWII, and fearing a potential Soviet invasion, the plan was expanded to include Switzerland’s entire infrastructure. The Swiss military wired all roads and railways with dynamite, which would be detonated in case of an attack. This way any invader would have to waste time and energy in getting into the country.

Over the years Switzerland has decreased the number of its active personnel from 400,000 in 1995, to 220,000 in 2004, and again to 100,000 men in 2016. Having a direct democracy, instead of a representative one, its citizens are active participants in all major decisions happening in the country, including when it comes to its military or going to war.

In fact, all citizens have military training, and get to keep their weapon after its completion. So, if it ever gets invaded, almost 4,000,000 citizens are immediately available for military service with another 3,000,000 fit for joining as well. Moreover, while so many decision makers around the world keep their wealth in Swiss bank accounts, it would be counter intuitive for them to risk losing it in the chaos of an invasion.



Iran flag

Active Personnel: 545,000, Reserve: 1,800,000
Tanks: 1,658, Artillery: 2,400
Air Fighters: 137, Helicopters: 140
Naval Strength: 398 (Submarines: 33)

You know that you are tough country when your nickname is “Fortress Iran”. In the recent decades, the Middle East has become a hot-spot for conflicts, extremism, and social and economic instability. While several of its neighbors have been and some of them are still in war, and despite many strong enemy governments like Saudi Arabia, USA and Turkey, Iran is still strong influence, stability factor in the region and hasn’t been invaded since World War Two.

Other than the tremendously big army and largest in the Middle East, the type of terrain has also big influence. Iran is covered by mountains, perfect for defensive facilities and underground bunkers which make it even more difficult and complicated to invade.

Last and maybe key factor why Iran is part of this list is the nuclear program. Many thinks that Iran use their nuclear program to create nuclear weapons. Even the UN deal with Iran to limit the country’s nuclear ambition, while ago the country start testing missiles capable of carrying a nuclear warhead.

7. Australia


Active Personnel: 60,000, Reserve: 44,000
Tanks: 59, Artillery: 75
Air Fighters: 78, Helicopters: 188
Naval Strength: 47 (Submarines: 6, Aircraft Carriers: 2) 

With a relatively small population, Australia is nevertheless huge country and continent of itself. Except the coast areas where 98 percent from the population live, deep inside 70 percent of the nation landmass is a desert. Perfect place for Australian army to hide and lunch attacks to any invader.

The only nearby power that can consider attack to Australia is Japan, but since both countries have been allies for years and years in the past and now, the Australians have nothing to worry about.

Interesting fact is that Japan during World War Two did actually planed invasion on Australia, but they abandon it cause of the above reasons.

According to the Global Peace Index, Australia ranks third in the Asia-Pacific region and 9th in the world.



Active Personnel: 250,000, Reserve: 42,000
Tanks: 777, Artillery: 839
Air Fighters: 289, Helicopters: 741
Naval Strength: 131 (Submarines: 17, Carriers: 3)

Besides being an island nation, which are always more difficult to invade , Japan also boasts a sizable army and a particularly powerful economy (the 4th largest in the world). Their national defense budget alone is somewhere around $49 billion, the sixth highest in the world.

The Japanese are notorious when it comes to the defense of their country, as was seen throughout history. During WWII, the Americans were more or less forced to drop nuclear bombs over two Japanese cities, in order to hasten the end of the war, since the Allies realized the word “surrender” doesn’t really exist in the minds of Japanese soldiers.

And even then  the country was not fully invaded. Japan has a total population of over 126 million, and around 1.2 million people reach military.


Canada flag

Active Personnel: 95,000, Reserve: 51,000
Tanks: 181, Artillery: 161
Air Fighters: 64, Helicopters: 175
Naval Strength: 63 (Submarines: 4)

Canada is the second largest country in terms of surface area after Russia, and equally as cold. Located at the northern fringes of the world, Canada would be quite difficult to invade, even though most of its 35 million people live close to the border with the United States.

By looking at its size and vast expanses of wilderness, taking over all of Canada by force could be problematic for anyone. Moreover, it’s mostly surrounded by oceans, and it only shares a border just with  USA , which is its ally and just happens to be the world’s largest superpower. Bringing in troops and holding a steady supply line would be quite difficult.

From an economic standpoint, the country is also well prepared to withstand a prolonged war of attrition if need be. Its defense budget is at $14.7 billion and the country is currently producing more oil than it consumes.

From the point of the terrain and land either unless you want to fight your way through America to get in Canada, the only other way by sailing through half-frozen waters, landing in the most remote parts of the country, then you need to trudge south through 6 meters deep snow and -50 degrees temperatures to get to the cities. And in the end after all that struggle, USA will probably attack you.



Active Personnel: 700,000, Reserve: 4,500,000
Tanks: 4,200, Artillery: 6,550
Air Fighters: 458, Helicopters: 222
Naval Strength: 967 (Submarines: 70)
Nuclear Warheads: 8

North Korea has larger military then every NATO member except Uncle Sam. As seen during the Korean War in the early 1950s, both South Korea and the United States tried to take down the North, but to no avail. And while there is a huge discrepancy between the technological advancements between the two Koreas nowadays, many of the reasons for why the initial invasion failed are still there. Since North Korea developed its own nuclear weapons, as well as the many crimes against humanity happening over there under the rule of the Kim family, these would certainly warrant an invasion, and regime overthrow by the UN. However this invasion is not foresee any time in the near future. The reasons have more to do with geopolitics than anything else, and pretty much everyone involved is unwilling to mount such an undertaking.

For starters, there’s China, which is North Korea’s biggest “ally” and who also supported it in the ’50s. They are content to keeping the country the way it is, as a sort of buffer zone between them and the South. Moreover, if something were to happen to North Korea, it is quite possible that millions of people would flood into Manchuria, trying to leave the country and destabilizing the northern Chinese region. And lastly, there’s the status quo between China and the US, where China has its sights on Taiwan and the US on DPRK. This way, neither is willing to make a move, not wanting to antagonize the other. The most likely “invasion” of North Korea would happen from within, in the form of a coup.


United Kingdom flag

Active Personnel: 150,000, Reserves: 182,000
Tanks: 407, Artillery: 227
Air Fighters: 91, Helicopters: 397
Naval Strength: 76 (Submarines: 10, Aircraft Carriers: 1)
Nuclear Warheads: 215

Island nations are among the most common in this list, and the United Kingdom is a prime example of a hard-to-invade country. During WWII, try as they might, Hitler and the Nazis were unable to mount an effective attack on the island, proving just how much 20 miles of open water means in organizing an effective landing. Surrounded by two oceans and the ever turbulent North Sea, the British Isle can only be effectively invaded from the South, across the English Chanel. But even this crossing is treacherous and difficult. The Southeastern English coast consists of steep cliffs, known as the White Cliffs of Dover. This way, any would-be invading fleet would be forced to drop anchor farther away, and be exposed to British artillery and its air force.

Its military is no joke either, with cutting edge technology and surveillance equipment. Its defense budget of $55 billion is the 5th largest in the world, as is its economy. It also has two aircraft carriers under construction, which are due to enter service in 2020 and 2022, respectively. Being a member of NATO, the UK has the advantage of strong allies who will come to their aid in case of any threat. In and of itself the United Kingdom has a more or less stable relationship with all nations around the globe.


Russian flag

Active Personnel: 766,000, Reserves: 2,485,000
Tanks: 15,400, Artillery: 10,600
Air Fighters: 751, Helicopters: 1,750
Naval Strength: 352 (Submarines: 60, Aircraft Carriers: 1)
Nuclear Warheads: 7,300

Without a doubt, Russia is an almost impossible country to conquer. As history has proven time and time again with the Swedish in the early 18th century, the French under Napoleon in 1812, and then the Nazis during WWII, the incredibly harsh Russian winter can bring even the mightiest of armies to its knees. In fact, Russia has some of the biggest temperature differences on the planet, with a record low of -70 Celsius degrees to a record high of +45 Celsius degrees.

Another major impediment in conquering Russia is its sheer size. Being the largest country in the world, with 6.6 million square miles, much of the country is made out of mountains and wilderness, huge part of it covered with ice and snow, perfect for hidden military bases and surprise attacks.

Since the fall of the Soviet Union, the Russian military stagnated, but recently it has begun to grow. Since 2008, the country’s annual military spending has increased by almost a third and is now at $66 billion. At present the country has the largest fleet of tanks in the world.

From all of the above we can realize that invade Russia is impossible.


USA flag

Active Personnel: 1,400,000, Reserves: 1,100,000
Tanks: 8,850, Artillery: 3,300
Air Fighters: 2,300, Helicopters: 7,100
Naval Strength: 415 (Submarines: 75, Aircraft Carriers: 19)
Nuclear Warheads: 7,100

Not surprisingly, the United States is first on this list. For starters, its geographical position. There are the truly vast expanses of the country and all the different types of terrain, from densely forested mountains to scorching deserts. Any invading force would have difficulty holding on to these places, regardless of who or what was defending them.

And then there’s the US Military. With a defense budget of $581 billion every year, it alone makes up almost a third of all money spent on the military in the world and more than the next seven highest-spending nation combined.

The country also holds hundreds of military bases around the world, and has been at war almost constantly over the past 25 years. The US is also notorious for destabilizing other nation states, engineering coups, overthrowing democratic governments, and backing military dictatorships in their stead. This interventionist policy keeps conflicts away from its borders by generating them somewhere else.

On top of all this the USA has enough nukes to kill everyone on Earth several time over. So, yeah they are pretty safe.