Having the Ukrainian flag visible should be enough. If you don't think so, get a lapel pin. And then just don't bring it up.

I work with a Trumpster. It was hard at first. He liked to brag about his guns, talk about how he refused to get vaccinated. He caught COVID. I said nothing. He got extremely lucky and it was mild. Relatively.

At any rate, as soon as you put a value on that kind of a relationship, it will be tested, and you will have to choose. If she isn't financially contributing and taking up arms, then history will show eventually, and anything broken can be mended.

Just don't compromise who you are and what you believe in order to keep the friendship. You are not compromising if you don't bring it up.