I'm citing @Dr_Gabriel_Aby@hexbear.net's comment here for the sake of simplicity.
On the latter part questioning Soviet opposition to Israel, from what little I know - a mix from listening to lectures and and some theoretical speculation papers - from the moment Stalin's body was laid to rest the Soviet presidium under the troika of Malenkov, Beria, and Khrushchev initially, and shortly later under Khrushchev alone, conducted an antagonistic diplomatic realignment with Israel that closely aligns with the reemergence of antisemitism within the Soviet Union.