Defending an ally from an enemy is not something the US government punishes people for. If you want to help the people of Ukraine then #standwithukraine.
This isn't true. You can certainly be prosecuted for committing crimes against enemies of the state. There's a reason we distinguish between law enforcement officials and civilians. Blur that line and things can get nasty.
Russia is a pariah amongst the world for their invasion of Ukraine.
The Ukrainian American veterans flying to Poland to defend Ukraine right now are also breaking US law, but there will not be any legal consequences for their courage and bravery.
For another country to go after US citizens, the country has to first file paperwork in US federal court, and then, have a judge care enough to proceed.
What drugs are you on to think Russia has any standing in US court regarding _anything_ that happens in Ukraine?
Yes, exactly. And some of us have been subject to the whims of prosecutors in the past. It's relatively easy to say that you trust the US to do what is right compared to Russia, it's much harder to put your faith and your future in the hands of any government.
Exactly. Prosecutors goals are to prosecute. Even if they don't see the prosecution through to the end because it becomes politically unfavorable, you might still sit in pre-trial detention for a decade before they drop the charges.