I would also say that after what happened in Syria he would prefer to back a winner.
Putin also has a big Islamic population problem. Muslim go radical in ways that Jews do not.
True. And some Jews never left since 2nd Temple sonec2,000 years ago, despite persecution by Islamic invaders. Search family Zinati in Pekiin.
Zimati - last Jew of Pekiin.
https://aish.com/the-last-jew-of-pekiin/