EU and NATO accuse President Alexander Lukashenko of using migrants as a weapon to pressure the West by sending migrants onto the borders of Poland and the Baltic states.
European governments accuse the Minsk government of luring refugees from the Middle East to Belarus to send them across the border to the European Union soil in retaliation for sanctions.
Polish PM accuses Minsk of "state terrorism" as Belarus warns Warsaw of violating internation norms in its treatment of migrants.
Hundreds of migrants seek to storm the border from Belarus into Poland, escalating a crisis along the EU's eastern border that has been simmering for months.
Maria Kolesnikova, one of the leaders of mass street protests against Belarusian President Alexander Lukashenko last year, has been sentenced to 11 years in prison.
The US says it will issue its largest round of sanctions to date on Belarusian individuals and entities, targeting the country's economy and the Belarusian National Olympic Committee.
The International Olympic Committee said it had removed the accreditations of Artur Shimak and Yury Maisevich.
Rights groups say at least five people were detained and 25 homes and offices searched in the third successive day of raids.
Babaryka was considered one of the strongest opponents to authoritarian leader Lukashenko, who has been in power for close to three decades.
The economic sanctions are the most sweeping measures imposed against Belarus so far by the EU and come after President Alexander Lukashenko sparked outrage by intercepting a Ryanair airplane in May to arrest dissident journalist Roman Protasevich.
UK, Canada, EU and US ratchet up pressure on President Alexander Lukashenko by imposing sanctions on several senior officials in Belarus over the forced diversion of a Ryanair plane to Minsk.
New laws aim to silence critics of Belarus President Alexander Lukashenko, whose victory in the presidential vote last year sparked huge demonstrations.
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