I don't think so. China has been nuked to hell, suffered both a plague and famine, a third warring states period and a massive outward emigration. It will be decades before it recover.
On what grounds could Israel demand reparations? A state demanding money due to the murder of people who were not its citizens in unprecedented in international law. Even OTL, Israel only received reparations from West Germany to compensate it for resettling the Holocaust survivors, paying individual Jews, and for stolen property. And that only happened because West Germany agreed, no court could compel Germany to pay Israel. Warsaw Pact states could simply claim that the Communist governments were illegitimate regimes and thus absolve themselves of any responsibility. The ones that still had governments-in-exile from WW2 could simply claim to be the successor of the government-in-exile. Vichy France was the legal and legitimate government of France and the successor of the Third Republic. On its own initiative, it decided to hand over Jews to the Germans. But France never paid any reparations to anyone for that until a decade or so ago. So how could the Warsaw Pact countries be expected to pay reparations to either Israel or the actual victims? America wouldn't pressure them, the countries are too destroyed to offer anything anyways. I would also expect nationalism in these countries to be even higher than the during the interbellum and World War 2, thanks to the revolutionary wars and the influx of refugees.
The money related to settlement like West Germany. The 'stick' as it were was simply the international denunciation of Israel, which has far higher international political capital; if they accuse an Eastern bloc nation of not living up to its responsibilities in bringing the practitioners of the Holocaust to justice, that will be taken extremely seriously by the wider world. When you say 'West Germany agreed', the logic is similar; the Israelis are standing on too high a moral high ground to publicly challenge. The young nations are still fragile and not interested in a pointless fight.
The number of Jews left in the Warsaw Pact nations is negligible at best; hardly a crippling monetary commitment, so Israel is not sacrificing much, but that's the point. The 'carrot' of reduced reparations was mostly a minor concession. Israel is wealthy enough to easily accommodate the survivors; it's just about making the deal seem like a good one to the Eastern bloc. Saying that you're getting something in return (no Holocaust guilt, diplomatic support from Israel, saved money - no matter how illusive these things are) for Mossad agents investigating alongside the police is much easier to sell than "Here's Mossad agents - listen to them."
This is an update focussing on Israeli efforts to take revenge on the Second Holocaust's perpetrators.
The Wrath of God
I can accept accept Israel using its soft power to convince nations to cooperate with them, but I doubt any nation would be willing to fork over any reparation money. Giving reparation money is an admission of guilt, and none of these countries will admit guilt, not when the people in charge of them fought against the Communists. And they don't have any money to give anyways. Transferring the reparations to Russia won't work either because expecting the CNS to pay up would be like milking a dead radioactive cow. And if the West has learned anything from the several decades, it's that demanding reparations from a ruined country causes radical nationalism.
Sounds more like Inglorious Basterds to me.I wonder if there is going to be a movie like Munich, with Mossad agents hunting down Soviet Pogrom perpetrators in particularly gory ways? Because hunting down mass murdering communists would be "Wish Fulfillment" for a lot of people ITTL.
Sound's like Israel is far better off in the long run and I would see Palestinian extremists praising Stalin like they praise Hitler in their propaganda.
However, China was not depopulated and with its large population it can recover, especially because it's a resource-rich nation.
I imagine he begged for one in his final moments, only for his Mossad captors to coldly tell him ,"so did your victims".