"As [U.S.] President [Barack] Obama said one year ago in Tallinn, today we are bound by our Treaty Alliance, we have a solemn duty to one another. [NATO] Article Five is crystal-clear – an attack on one is an attack on all. So, if in such a moment you ever ask again who will come to help, you'll know the answer - the NATO Alliance, including the Armed Forces of the United States of America," U.S. Ambassador to Latvia, Nancy Bikoff Pettit said on Tuesday, Ukraine Today reports.

The United States has stepped up partner training deployments to NATO allies in Eastern Europe since Russia last year seized and annexed Ukraine’s Crimean peninsula, raising concerns that Moscow’s next target may be member of the Alliance.

MQ-1 Predators have initially been used by the U.S.A.F. and CIA for aerial reconnaissance and forward observation, carrying cameras and other sensors. Later, they have been modified and upgraded to carry two missiles and other munitions.

See unian.info’s video section for more of the latest news from Ukraine in video from Ukraine Today, Ukraine’s 24-hour English-language news channel.