GEILENKIRCHEN, Germany (AP) — NATO deployed two surveillance aircraft Wednesday to monitor Ukraine’s air space and Black Sea ship movements as Russia consolidated its military buildup in Crimea.

NATO headquarters spokesman Lt. Col. Jay Janzen said one aircraft based in England would observe Russian air and sea movements from Polish air space, while the other based in Germany would fly over Romania. Both Poland and Romania are NATO members and border Ukraine, and Romania’s Black Sea coast is only about 220 kilometers (140 miles) from the Crimean peninsula.