I highly recommend Squad. It's a solid middle ground between Battlefield and ARMA. The community aspect behind it makes it great and communication is key to success.

The Donbass and Crimea are currently occupied by Russia, there's never been any Ukrainian held election allowing for the secession of this territory. These regions are not self governing entities that can make this determination. With all due respect, you seem a bit dull, so I'll just leave it at that.

When the Taiwanese people democratically declare they want to become part of China. I don't see the US sending military aid to China as long as their claims to the South China Sea don't respect international maritime law. I'd also imagine respecting intellectual property rights is a concern, in addition to China's genocidal actions towards the Uyghurs.

I define rightfully as internationally recognized sovereign territory, further backed up by the agreements the aggressor made in the past.

Russia falling on its face, as an aggressor in this invasion, to a country ran by a comedian really helps to put context to Russia's decline. They basically shot themselves in the foot and if there weren't lives being lost, it'd be fairly comedic.

Ukraine will continue to fight for what is rightfully theirs. They've done an outstanding job so far, and it's really highlighted the decline of Russian influence on the world stage. Russia is nothing more than a petrodollar fueled aggressor.