Poland and Baltic States Threaten Border Closure with Belarus Over Wagner Group and Migrant Concerns

Interior ministers demand the expulsion of Russian mercenaries from Belarusian territory.
Countries warn they will seal borders if military incidents occur or migrant influx grows.
Nations support Ukraine against Russia's invasion and discuss joint responses.
Tensions predate war in Ukraine and involve border security and migrant crossings.
Future of Wagner Group unclear after reported death of leader Yevgeny Prigozhin.