“In recent months Russia has flown fighter jets into Estonian airspace and sent dozens of drones deep into Polish and Romanian territory. Its ally Belarus has repeatedly brought Lithuanian air traffic to a standstill by allowing giant balloons to cross its borders. And last week, Moscow’s top envoy Sergey Lavrov issued a veiled threat to Finland to exit NATO.”
https://www.politico.eu/article/frontline-states-eu-cash-russia-threat-defense