"The President's conversation with the leaders of the Bucharest Nine <...> lasted from 15:17 to 15:57 Eastern time (23: 17-23: 57 Moscow time)", - RIA Novosti is quoted as saying.
It is noted that the conversation took place following an online meeting between Biden and Russian President Vladimir Putin and a telephone conversation between the American leader and Ukrainian President Vladimir Zelensky.
The Nine countries include Bulgaria, Czech Republic, Lithuania, Latvia, Estonia, Hungary, Poland, Romania and Slovakia.
Earlier it became known that US military officials are not yet consulting on strengthening NATO's eastern flank.