In event of Russian attack on EU, Poland must hold Suwałki Corridor and serve as pillar of NATO, - military official. PHOTO Poland has been identified as a key pillar of NATO’s eastern flank in the event of a potential Russian attack. Warsaw is not only becoming a strategic rear base for the Baltic states, but has already begun deploying troops equipped with heavy machinery on Latvian territory. 3 895 29 Previously in trend: The possibility of World War III