Even though the kibbutz system was socialist in ideology, it was never marxist. They existed before israel, and were used by the zionists as a tool for colonization. If the israeli state was socialist, every socdem country at the time should be considered socialist which is absurd. The israeli government to this day directly owns 93% of the land. Again, just another tool to disenfranchise the indigenous population
The USSR withdrew support for israel before it was even 10 years old. They should never have recognized it in the first place, given MLs have hated zionism since Lenin