The name is Vasiliy Matuzok.

According to the people who have studied with him in MGIMO he survived and then was brought to Rome under the protection of the UN high commissioner for refugee affairs. Apparently he confided classified information to the «Far Eastern Economic Review»; He also gave an interview to «Time» and to «Radio Liberty» framing his defection into the narrative of a jail-break.

According to a Russian journalist in South Korea Matuzok currently resides in California. That's the reply he has received from a South Korean guide