"The ceremony is planning to be held on November 19," the source said.
The ceremony of presenting credentials is held in Moscow several times a year. No official confirmation has been available yet.
John Tefft, 64, is a career diplomat. He was the US ambassador to Ukraine, Georgia and Lithuania. Earlier, he worked as deputy ambassador to Russia.
From November 1996 to September 1997 he was charge d’affairs to Russia.
Tefft took other posts in the US State Department. He also worked in Rome, Budapest and Jerusalem.
Tefft arrived in Moscow on September 5.