My Grandfather felt that strongly about Germany. He went to the French Embassy in DC to help, and joined the French Army in 1915.
Nothing stopping you if you feel that strongly about Russia. Ukraine also has an embassy in DC.
A man has to follow his heart.
Russia isn’t Germany, Russia was more monstrous before Germany, then allied with Germany, and then came out of WWII as the enemy of the world, and while suffering a collapse in 1991, is starting to regain it’s footing and seeking it’s eternal goals.
Germany and Poland and France and Japan are our allies, Russia is still a threat and hostile, and on the move.
By the way, if that was a dig at opposing you guys and enlisting to prove it, I already served in NATO under President Reagan, generations of Americans have served in our defensive alliance against Russia, and many of our WWII fathers before us had opinions on Russia and the future threat.
If you want to serve Putin and empire, then go enlist for him or get some mercenary work fighting for him in Ukraine.