A leading Belarusian opposition figure freed from prison by President Alexander Lukashenko said on Sunday his wife would continue to lead the exiled movement, and urged supporters to keep fighting for change and the release of political prisoners.

Sergei Tikhanovsky, the husband of Belarus' opposition leader, has called on US President Donald Trump to "just say the word" and ask for all political prisoners in Belarus to be released.

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.