Spanish pilots and soldiers stand in front of a Spanish Eurofighter Typhoon jet during a ceremony at Graf Ignatievo air base in central Bulgaria on February 17.
German and Spanish jets arrived at military bases in Romania and Bulgaria on February 17 as part of a deployment of airpower to NATO's eastern flanks amid tensions between Russia and Ukraine.
A Ukrainian tank and armored vehicle collide during a training exercise near Rivne, western Ukraine, on February 16.
An Iskander missile system during the Allied Resolve joint military exercises held by Russia and Belarus in the Mogilev region of Belarus on February 17.
A Ukrainian soldier stands near the site of a shelling of a kindergarten in the Ukrainian settlement of Stanytsia Luhanska on February 17.
A Russia-backed separatist in a trench outside the settlement of Molodizhne in the Luhansk region of eastern Ukraine on February 17.
Ukrainian National Guard soldiers at a mobile checkpoint on the outskirts of Kharkiv on February 17.
A German Air Force pilot waves after landing at Mihail Kogalniceanu air base in Constanta, Romania, on February 17.
Ukrainian President Volodymyr Zelenskiy (second from right) meets with soldiers in the Donetsk region on February 17.
A Russia-backed separatist in an abandoned school in the settlement of Molodizhne in the Luhansk region on February 17.
Belarusian leader Alyaksandr Lukashenka (center) watches joint military exercises held with Russia in the Mogilev region of Belarus on February 17.
Russian tanks being transported by rail from a shooting range in Russia on February 18. According to a Russian Defense Ministry official, units of the Western and Southern military districts on February 15 began returning from exercises to their bases by rail and road. Meanwhile, Western officials maintain that the risk of an imminent Russian invasion of Ukraine remains "very high" and dispute any Russian claims of troop withdrawals.
Cargo is unloaded at the Malacky air base in Slovakia on February 17 for the 2nd Cavalry Regiment of the U.S. Army as a planned NATO drill called Saber Strike 22 was under way.
The Russian cruiser Moskva fires its guns while holding exercises in the Black Sea near Sevastopol, Crimea, on February 18.
An elderly woman passes the site of what local Ukrainian officials say is the crater from an artillery shell that landed in Vrubivka in the Luhansk region of eastern Ukraine on February 17.