Belarus issued a ruling on Wednesday temporarily restricting access to parts of the southeastern Gomel region that borders Ukraine and Russia.
The government said on its website it would "temporarily restrict entry, temporary stay and movement in the border zone within the Loevsky, Braginsky and Khoiniki districts of the Gomel region."
Russian forces used Belarus as a launch pad for their abortive attack on the Ukrainian capital Kyiv in February, and there has been growing Russian and Belarusian military activity in recent months.
The government did not indicate how long the restriction would last but said that it did not apply officials, and workers and residents of those areas.
Belarus's role in the Russia-Ukraine War
Belarus began staging what it called anti-sabotage drills in the Gomel region on Oct. 11. Russian servicemen arrived in Belarus four days later to join a regional grouping that the neighbors have set up.
Russian President Vladimir Putin visited Belarus on Monday, his first trip to the country since 2019, raising fears in Kyiv that he intends to pressure Russia's fellow former Soviet ally to open a new invasion front against Ukraine.