There is lots going on in Eastern Europe. Russia is alarmed by Nato's expansion in Eastern Europe and Baltics. Kremlin spokesman has said that Moscow will act as a result of Nato expansion. Relations between Russia and Nato are quickly rolling back towards Cols War. War games in Poland got Russia attention. At the same time US is planning to deploy 1000 troops to Poland .In response Putin then deployed troops to Ukrainian  border as a response. That's is very dengeres game !