A senior Ukrainian defense official told Business Insider that the Delta system has increased combat efficiency and decision-making speed.

A push by the Trump administration to end Russia's war on Ukraine appears to make headway, with Kyiv saying Zelenskyy could visit D.C. within days to finalize a deal.

Top U.S. and Ukrainian officials said Sunday they were making progress toward ending the Russia-Ukraine war but provided scant details.

Officials say progress was made in urgent weekend talks on amending the U.S. peace proposal for Ukraine that many saw as favoring Russia. But the Kremlin on Monday said it hadn't seen the changes.

From the front-line city of Pokrovsk in eastern Donetsk, to Zaporizhzhia in the south, there is little doubt that Russia is making advances. But, battlefield monitors suggest the picture is not quite so bleak for Ukraine as Trump and Putin suggest.

Fox News chief national security correspondent Jennifer Griffin has the latest on talks to end the war in Ukraine on 'The Story.'

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President Volodymyr Zelenskyy said Monday that Kyiv was working with partners "to look for compromises that strengthen, but not weaken us."