Sergei Kislyak
Sergei Kislyak

Russia's former ambassador to Washington, Sergei Kislyak, said on Saturday his conversations with former White House national security adviser Michael Flynn had been transparent and focussed on matters of US-Russia cooperation.

Kislyak ended his tenure in Washington in July but remains a key figure in ongoing US investigations into Moscow's alleged meddling in the 2016 presidential election.

"We only spoke about the most simple things ... but the communication was completely correct, calm, absolutely transparent. In any case, there were no secrets on our side," Kislyak said.