Russian defence ministry says U.S. troops in east Ukraine - Interfax
A day earlier, Washington accused Russia of building up air defence systems inside eastern Ukraine and of involvement in training exercises of pro-Russian rebels in breach of a European-brokered truce.
Igor Konashenkov was quoted as saying that U.S. troops were training Ukrainian forces not only in western Ukraine "as Ukrainian TV channels show, but directly in the combat zone in the area of Mariupol, Severodonetsk, Artyomovsk and Volnovakha".
The Defence Ministry confirmed the report.
(Reporting by Gabriela Baczynska, editing by Elizabeth Piper)