Trump's Russian connection

Trump’s top adviser, Paul Manafort, has spent much of his recent career working for pro-Russian forces in Ukraine, and doing complex deals for an oligarch with close ties to Putin.

Manafort may be best known for managing the 2010 campaign of Viktor Yanukovych, the Ukrainian politician whose ouster as president prompted a Russian invasion of the country. He has, according to court documents, managed tens of millions of dollars for Oleg Deripaska, an oligarch denied entry to the U.S. reportedly for ties to organized crime, but so close to Vladimir Putin that top Russian officials fought (unsuccessfully) to get him a visa.
https://www.buzzfeed.com/bensmith/manafort-russia