Were they always neutral vis-a-vis Ukraine, or were they forced into neutrality quite recently by Russian-Turkey-Arab collaboration?
Why would a neutral Jewish group be acting in American interests against Russia?
The Jewish Agency in Russia was a CIA franchise, acting for the US to Russian detriment. This would not have gone without the tacit acceptance of Mossad.
It's only in the last month or so that Israel has decided to push more for neutrality given inevitable russian victory and closer co-ordination between Russia and the Arab world.