Ukraine has a Jewish president. At this point it would be hard to argue that either Russia or Ukraine is more, or less, anti-semitic. Suggesting that foreign policy is based on something that happened in the Cossack rebellion 350 years is ridiculous. From a Jewish perspective, we should be strongly be encouraging a peaceful resolution of the conflict.
From an American perspective, if the US (which guaranteed Ukraine’s territorial integrity in return for their giving up nuclear weapons, a promise made under Clinton, and dishonored under Obama) tolerates Russian conquest of Ukraine,they will be inviting Russian attempts to take over other countries in Eastern Europe. As was shown in the 1930s, appeasing bullies just encourages them.
Given that the US under Biden is cutting back its military resources, the US will have less and less influence, which will be bad for Jews since over the century, it has been the Americans who have been critical in defeating anti-Jewish forces (the Nazis, the Communists, and now the more radical Muslims). A situation in which the United States is militarily weak, and no longer committed to support freedom abroad, will be “bad for the Jews”.