Do you have more on this? Thanks.
NATO sends troops to Poland, Baltic states to face off with Russia
http://www.csmonitor.com/World/2016/0709/NATO-sends-troops-to-Poland-Baltic-states-to-face-off-with-Russia
Nervous Baltics on war footing as NATO tries to deter Russia
http://www.reuters.com/article/us-nato-russia-idUSKCN0YZ0LW
US confirms it will place 250 tanks in eastern Europe to counter Russian threat
http://www.telegraph.co.uk/news/worldnews/europe/11693497/US-confirms-it-will-place-250-tanks-in-eastern-Europe-to-counter-Russian-threat.html
Plus eastern Europe - Poland.
United States missile defense complex in Poland
https://en.wikipedia.org/wiki/United_States_missile_defense_complex_in_Poland
The United States missile defense complex in Poland, also called the European Interceptor Site (EIS), was a planned American missile defense base. It was intended to contain 10 silo-based interceptors: two-stage versions of the existing three-stage Ground Based Interceptors with Exoatmospheric Kill Vehicles that had a closing speed of about 7 km/s. The first planned complex was to be located near Redzikowo, Poland, forming a Ground-Based Midcourse Defense system in conjunction with a U.S. narrow-beam midcourse tracking and discrimination radar system located in Brdy, Czech Republic. EIS was cancelled in 2009 and subsequently replaced with a phased plan—the Aegis Ballistic Missile Defense System, which will include SM-3 Block IIA interceptors to be positioned in Poland from 2018.