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In an interview with Ukraine's Priamiy TV Channel, Volker said that the defense ministers do not come "empty-handed," therefore Secretary of Defense James Mattis brought certain defense equipment for the Ukrainian army, ZN.UA reported.

Read alsoU.S. envoy backs fresh ceasefire in east UkraineAt the same time, Volker said that the U.S. would never recognize the annexation of Crimea, and the restoration of Ukraine's sovereignty must take place through security systems in Ukraine.

The U.S. special envoy also said that Ukraine is not yet ready to join NATO.