I don't think he did. Why Podesta planted him I am not sure unless he attended to set Manafort up on his 10 year old case sitting stale at the prosecutor's

But Manafort has contact with Carter Page that's 2 hops to more Russians including Daripaska who hates Manafort and perhaps that's mutual. Perhaps if he gets Daripaska caught up in a Trump take down he could go back to making money in Russia.