Poland and Lithuania will soon close the border.

Poland and Lithuania are forced to strengthen the border due to the Wagner threat

This refers to the part of the border that borders Belarus. The main reason for this decision is the threat from Wagner forces. Poland and Lithuania have to take such radical measures to protect their territorial integrity. 

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Lithuania has repeatedly appealed to Western allies for protection from Wagner forces. They can disguise and infiltrate the territory of another country. Furthermore, they can even enter the European Union. Lithuanian officials also do not exclude possible provocations from Wagner. 

The Polish side is also concerned about a possible Wagner incursion. According to Jarosław Kaczyński, they did not come to Belarus for a vacation.