The NATO alliance held joint military exercises June 1 in Poland, Lithuania, Estonia and Latvia amid escalating tensions between eastern European nations and Russia. NATO has stepped up the size and training of its forces in recent months in response to a marked uptick in Russian military activity, including Moscow’s purported involvement in the eastern Ukraine conflict.
International Business Times: NATO holds military exercises in Baltic states amid increased Russian activity

Polish soldiers watch as US troops from the 5th Battalion of the 7th Air Defense Regiment emplace a launching station of the Patriot air and missile defence system at a test range in Sochaczew, Poland, on March 21, 2015.