The January 2016 gathering, confirmed by multiple participants and contemporaneous memos, brought some of Ukraine's top corruption prosecutors and investigators face to face with members of former President Obama's National Security Council (NSC), FBI, State Department and Department of Justice (DOJ).

The agenda suggested the purpose was training and coordination. But Ukrainian participants said it didn't take long — during the meetings and afterward — to realize the Americans' objectives included two politically hot investigations: one that touched Vice President Joe Biden's family and one that involved a lobbying firm linked closely to then-candidate Trump. -The Hill

The Obama officials - likely knowing that lobbyist Paul Manafort was about to join President Trump's campaign soon (he joined that March), were interested in reviving a closed investigation into payments to US figures from Ukraine's pro-Russia Party of Regions - which both Paul Manafort and Tony Podesta did unregistered work for, according to former Ukrainian Embassy political officer Andrii Telizhenko.