Ukrainian who helped Donald Trump sell units in Trump World Tower. he was in business with Tamir Sapir.

From Bloomberg:
““I gave him 30 days, and in exactly 30 days he paid me back,” says Kislin, now 82. “He never gave me any trouble.”
https://www.bloomberg.com/news/articles/2017-03-16/behind-trump-s-russia-romance-there-s-a-tower-full-of-oligarchs