The United States president may join the so-called "Normandy Four" heads of state, who deal with settlement of the armed conflict in the Eastern Ukraine, if he receives such an invitation.
The diplomat stressed that Obama speaks with Russian President Vladimir Putin and other "Normandy Four" heads of state on the phone from time to time. However, in Tefft's opinion, the parties of the negotiation group are doing an excellent job with the task without the American president.
He praised efforts of German Chancellor Angela Merkel and French President Francois Hollande is achieving the set task.
The negotiations in the so-called "Normandy format" on peaceful settlement of the conflict in the Donbas are held with the participation of President of Ukraine Petro Poroshenko, French President Francois Hollande, German Chancellor Angela Merkel and Russian President Vladimir Putin. The same format applies to meetings of the foreign ministers of these states.