Photo from UNIAN

On his second visit to Ukraine within three weeks, Scaparrotti, the dual-hatted Supreme NATO commander and head of U.S. European Command, went to eastern Ukraine, "where he visited Ukrainian military units involved in combat operations with Russians and their proxy forces" along what is called the "line of contact," EuCom said in a statement, reports.

Scaparrotti also met with Ukrainian Minister of Defense Stepan Poltorak and Chief of the General Staff Viktor Muzhenko on the continuing training of Ukrainian forces by NATO and the supply of "non-lethal" aid by the U.S.

Read alsoNew EUCOM, Supreme Allied Commander appointed (photo)The EuCom statement said Scaparrotti's visit underlined the U.S. and allied commitment to Ukraine's defense. "The United States continues to call for an immediate end to Russia's occupation of Crimea and for Russia to cease its destabilizing actions in Ukraine and honor its commitments in the Minsk agreements," it states.

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The tour of the eastern combat zone came three weeks after Scaparrotti's last visit to Ukraine, during which he met with U.S. troops of the Joint Multinational Training Group-Ukraine at the International Peacekeeping and Security Center in Yavoriv, well away from the front lines.

Read alsoU.S. army to continue supporting Ukraine no matter who is elected president - Gen. HodgesDuring the November visit, Scaparrotti observed the training of Ukrainian forces by a multinational group including troops from the U.S., Poland, Lithuania, Canada and Britain.

Scaparrotti's latest visit to Ukraine came on the same day that a European Union meeting in Brussels agreed to extend sanctions on Russia for six months over the takeover of Crimea and the intervention in eastern Ukraine. Russia's annexation of Crimea in 2014 triggered the first round of sanctions.