mdd1 > How many shuls are there already in Ukraine?
I don’t know. The first result by google search is
Jews in Odessa synagogue pray together for peace YouTube · i24NEWS English Feb 27, 2022
so there are some.
If you are looking for halachic guidance here: there is a recent interview by Rabbi of Moscow (who looks American or European and yeshivish) explaining why he ran away from Russia after the war started. He sounds like an expert. I suggest find his interview and go from there. Maybe contact him and ask.