I don't think you can stop the war in Ukraine but you might help rescue people out of there so they don't die there

For most people who stay in Ukraine now they might die. So, rescuing people out of Ukraine before they die is a noble cause. 

I was watching people trying to take asylum here in the U.S. by coming up through Mexico on TV today. I wouldn't recommend that because of what Trump did to mess up Asylum seekers from Mexico. I think if a Ukrainian could afford it they should go to Canada instead because I'm not sure trying to come from Mexico through the U.S. border there is going to work (at least right now) for Ukrainian Asylum seekers trying to take refuge here in the U.S. (at least yet).

I know Biden said he is trying to get Ukrainians into the U.S. for Asylum but this might take time. So, if you are serious about asylum in the U.S. try coming through Canada. I think knowing what I know I might go to Vancouver Canada and try to drive across the border and seek Asylum that way. However, you should check in this before you do this too.

Also, there are many many Ukrainians living here in the U.S. for one or more generations. If you know any of them contact them first maybe and they might be able to help you.