Feb 2014: Ukrainian Rabbi Tells Kiev's Jews to Flee City
Feb 2018: Ukrainian monument to Jewish Holocaust victims vandalized
Dec 2021: Ukraine - Swastika and antisemitic leaflets near the menorah in Uzhgorod
Your first article talks about a single congregation fleeing as a precaution. It doesn't say who they're afraid of, and since there have been no anti-semitic attacks in Ukrainian controlled territory, the Chief Rabbi and the other Jewish leaders are correct.
As for the vandalization: the Jews themselves view them as Russian provocations.
So yes, "Ukrainian Jews are firmly on the side of Ukraine against the Russians." In fact, Ukraine's current President is Jewish and a former TV actor.