U.S. President Donald Trump’s special envoy Keith Kellogg said in Kyiv on Monday that officials are “working very, very hard” on efforts to end the three-year war between Russia and Ukraine, as a lack of progress fuels doubts about whether a peace settlement could be on the horizon.

The Ukrainian military has made headlines for its air war tactics during World War I against Russia's drone attacks. Pilots and gunners on old-fashioned propeller aircraft lean out and shoot down drones with shotguns and rifles.

Ukrainians are hunting down Russian drones armed with nothing more than shotguns and rifles while dangling out of prop lanes as part of a low-tech solution to Moscow’s high-tech aerial assassins. Although Kyiv has some of the West’s most advanced air-defense systems,