Military aid from the United States arrives in Ukraine

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine, at the Boryspil airport outside Kyiv, Ukraine, on Tuesday. The U.S. moves are being done in tandem with actions by other NATO member governments to bolster a defensive presence in Eastern Europe.

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine at the Boryspil airport, outside Kyiv, Ukraine.

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine at the Boryspil airport, outside Kyiv, Ukraine.

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine at the Boryspil airport, outside Kyiv, Ukraine.

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine at the Boryspil airport, outside Kyiv, Ukraine.

Workers unload a shipment of military aid delivered as part of the United States of America's security assistance to Ukraine at the Boryspil airport, outside Kyiv, Ukraine.

Ammunition for a machine gun is seen in a shelter on the territory controlled by pro-Russian militants at frontline with Ukrainian government forces in Slavyanoserbsk, Ukraine, on Tuesday. Ukraine's leaders sought to reassure the nation that a feared invasion from neighboring Russia was not imminent, even as they acknowledged the threat is real and prepared to accept a shipment of American military equipment Tuesday to shore up their defenses.

A serviceman holds his machine gun in a shelter on the territory controlled by pro-Russian militants at frontline with Ukrainian government forces in Slavyanoserbsk, Ukraine.

A woman walks with her dogs on the territory controlled by pro-Russian militants near frontline with Ukrainian government forces in Slavyanoserbsk, Ukraine.

A serviceman checks his machine gun in a shelter on the territory controlled by pro-Russian militants at frontline with Ukrainian government forces in Slavyanoserbsk, Ukraine.