Ukraine hasn't previously stated openly that it uses the advanced U.S.-provided ballistic missile systems on targets inside Russia.

The chief of Russia's general staff told President Vladimir Putin on Thursday that Russian forces had taken control of the northeastern Ukrainian city of Kupiansk, but Ukraine's military denied the city had changed hands.

A top-secret Russian unit based in Moscow has changed the landscape of drone warfare, turning what was an advantage for the Ukrainians into a vulnerability.

Senior Pentagon officials have arrived in Ukraine to "discuss efforts to end the war" with Russia, the US military says. US Army Secretary Dan Driscoll held talks with Ukrainian P

"It’s very easy to draw the wrong conclusions from the war in Ukraine," Drummond said, referring to slow progress on the front line, adding that a future conflict with a reconstituted Russian armed forces would be "fast paced" with a greater use of air power in the opening weeks.

While the U.S. has taken part in previous iterations of the military exercise, this year's U.S. footprint was smaller as allied nations are pressed by the Trump administration to put more into European defense.

Myanmar says it has commissioned new Russian helicopters and Chinese airplanes into its air force as the two nations continue to supply the country’s military-run government with equipment despite international pressure to end its bloody civil war.