Russian President Vladimir Putin's decision to offer mercenary fighters of Yevgeny Prigozhin's Wagner group the choice of relocating to Belarus has led to fears among eastern NATO members that their presence will cause greater instability in the region.
"Over 1,000 soldiers and almost 200 units of equipment from the 12th and 17th Mechanized Brigades are starting to move to the east of the country," Mariusz Blaszczak wrote on Twitter.
"This is a demonstration of our readiness to respond to attempts at destabilisation near the border of our country."
Last Sunday Poland said it would send 500 police to shore up security at its border with Belarus.
Poland has seen an increase in the number of migrants trying to cross the Belarus border in recent weeks. According to the Border Guard, more than 200 people tried to cross illegally on Friday, including citizens of Morocco, India and Ethiopia.
Poland has accused Belarus of artificially creating a migrant crisis on the border since 2021 by flying in people from the Middle East and Africa and attempting to push them across the frontier.
A senior Wagner commander was quoted as saying on Saturday that mercenaries from the group were preparing to move to Belarus.
