Skip to 1:10 to see Senator Graham speak to Ukranian forces: https://www.youtube.com/watch?v=5Eds-8P0VfA
Today, according to RT America, US troops arrived to assist in Estonia (northern Russian front): https://www.rt.com/news/376513-us-tanks-arrive-estonia/
As Congress has not declared war, Senators are operating on their authority with no approval from the American population. This is outside the bounds of their Constitutional authority. Only Congress can declare war in the United States.
Apparently, Congress has a history of creating legal euphemisms to avoid a formal declaration of war. That is illegal in the United States.