Igor Sutyagin, a Russian scientist jailed for spying for the United States, arrived in Vienna, Austria, on Thursday, Russian state news agency Ria Novosti reported, citing his lawyer, Anna Stavitskaya.

Stavitskaya said Sutyagin could be part of a swap involving the suspected Russian spies detained in the United States in late June.

"Igor's father received a phone call at approximately 16:30 Moscow time (8:30 a.m. ET), and he was told that he [Sutyagin] was seen getting off a plane in Vienna," she said, according to Ria Novosti.