Siarhei Tsikhanouski, a leading Belarus opposition figure, was freed on Saturday after more than five years in prison, in the most significant move so far by President Alexander Lukashenko to try to ease his isolation from the West.

U.S. special envoy Keith Kellogg met Belarusian President Alexander Lukashenko in Minsk, the highest-profile visit of a U.S. official to the authoritarian state in years.

Belarus has freed Sergey Tikhanovsky, a key dissident figure and the husband of exiled opposition leader Svetlana Tikhanovskaya, following a rare visit by a senior US official, Tikhanovskaya’s team announced on Saturday.