China

China is another country that’s very hard to invade. First, it has one of the biggest populations in the world. The country is one of the most populated in the world. 

Thanks to the large population, they can bring in more firepower from their military. Additionally, they are well trained with very good air and water support.

Additionally, they are known for their advanced technology. This technology can be seen in Fintech and robotics, too. Besides that, the Chinese government has strong control over its land and citizens.