Anyone familiar with the luxury real estate market knows that no one loves an Upper East Side townhouse or Central Park penthouse more than a Russian billionaire (who'll probably just use it as a part-time pied-à-terre). But alas, with sanctions and asset-freezes already hitting some of the wealthiest oligarchs who split their time here in New York, their lavish properties may be at risk - and it's no wonder quite a few big names have started trying to sell them off. Wondering how the Russian half lives in Manhattan? Click through for a peek at their real estate portfolios.