Here are my picks.
1. Costliest invasion - Afghanistan. There are still plenty of narrow roads and band infrastructure so that an invasion like the USSR and the failure that followed can be copied. Countless land vehicles will be stalled and disposed of in the narrow mountain ways and high-tech helicopters would fall due to their slick rocket lauchers from the 80s.
2. Bloodiest invasion - I opt for China. They have a massive reserve of people which means that when you bomb a population center millions will die. After that they'll start evacuating and create refugee camps that would make even bigger population concentrations.
3. Longest Invasion - Russia. So much territory, so many people, so many places to hide. Worst climate to handle. The partisans will never stop harrasing your occupying forces. NEVER.
4. Most difficult invasion- I'm not sure what to write here. I suppose one could claim the North Korea would be the most difficult if you assume they have the same mindset as the Japanese during WW2. Which means it'll never end and will be especially deadly since they have nuclear weapons. Ouch.
1. Costliest invasion - Afghanistan. There are still plenty of narrow roads and band infrastructure so that an invasion like the USSR and the failure that followed can be copied. Countless land vehicles will be stalled and disposed of in the narrow mountain ways and high-tech helicopters would fall due to their slick rocket lauchers from the 80s.
2. Bloodiest invasion - I opt for China. They have a massive reserve of people which means that when you bomb a population center millions will die. After that they'll start evacuating and create refugee camps that would make even bigger population concentrations.
3. Longest Invasion - Russia. So much territory, so many people, so many places to hide. Worst climate to handle. The partisans will never stop harrasing your occupying forces. NEVER.
4. Most difficult invasion- I'm not sure what to write here. I suppose one could claim the North Korea would be the most difficult if you assume they have the same mindset as the Japanese during WW2. Which means it'll never end and will be especially deadly since they have nuclear weapons. Ouch.