An ever-growing pile of circumstantial evidence suggests that the Trump campaign colluded with Russian efforts to turn the 2016 presidential election in its favor. Given Manafort’s long relationship with close Kremlin allies including Yanukovych and Deripaska, and in particular his indebtedness to the latter, it is hard to imagine him as either a naive or passive actor in such a scheme. Manafort was in the room with Donald Trump Jr. when a Russian lawyer and lobbyist descended on Trump Tower in the summer of 2016, promising incriminating material on Hillary Clinton. That same summer, the Trump campaign, with Manafort as its manager, successfully changed the GOP’s platform, watering down support for Ukraine’s pro-Western, post-Yanukovych government, a change welcomed by Russia and previously anathema to Republicans.https://www.theatlantic.com/magazine/ar ... er/550925/
The Russians offered the "dirt" on Clinton and the Wikileaks dump in exchange for the lifting of sanctions with a promise cash flow for Manafort and Trump for to get out of debt.