Nervous NATO nations are beefing up security due to Wagner fighters across their borders in Belarus

NATO allies located along the alliance’s eastern front are growing increasingly worried about the presence of Russia-linked Wagner group mercenaries in Belarus, where some have been deployed since a short-lived mutiny in Russia in June.

Poland, Lithuania and Latvia — members of NATO and the European Union which border Belarus — had already been on alert since large numbers of migrants and refugees began arriving at their borders from Belarus two years ago. They have accused Belarus leader Alexander Lukashenko, an ally of Russia, of opening the migration route in an act of “hybrid warfare” aimed at creating instability in the West.