The United States deployed a battery of Patriot long-range anti-aircraft missiles in Lithuania to be used in NATO wargames from Tuesday — the first time the advanced defense system has been brought to the Baltics where Russia has air superiority.

The Patriot battery was brought to the Siauliai military airbase on Monday, ahead of the Tobruk Legacy exercise, and will be withdrawn when the exercise ends on July 22, a Lithuanian defence ministry spokeswoman told Reuters.

The NATO wargames take place ahead of the large-scale Zapad 2017 exercise by Russia and Belarus which NATO officials believe could bring more than 100,000 troops to the borders of Poland and the three Baltic NATO allies — the biggest such Russian maneuvers since 2013.