By Max Hunder KHARKIV REGION, Ukraine, April 29 (Reuters) - In a foggy field in northeast Ukraine, four soldiers stare at red and yellow dots on a screen in the back of a van, armed with interceptor drones and energy drinks to get through the night.

Ukraine-Russia war latest: US ambassador to Kyiv to leave ‘over differences with Trump’ - Julie Davis will leave role amid a lull in negotiations to end the conflict

You cannot threaten the free world and lead it at the same time. No nation can match American might, but for the first time in my adult life, the moral and strategic heart of the defense of liberal democracy doesn’t beat in Washington.

Russia's Tuapse oil refinery disaster deepens after Ukraine's drones strike yet again * At least 2 people injured in Kyiv as daytime Russian drone attack hits

Ukrainian ground robots and drones have demonstrated how to overcome a Russian military position by themselves while forcing the surrender of Russian soldiers, claimed Ukrainian President Volodymyr Zelenskyy.

I’m absolutely proud of representing the nation of free, brave, and the most stoic people, I think, on the whole planet,” Stefanishyna told me, as Russia continued to slam Ukrainian cities with drones and ballistic and cruise missiles.

Former Senate Republican Leader Mitch McConnell (Ky.), who now chairs the powerful Senate Defense Appropriations Subcommittee, is taking the Pentagon to task for sitting on $400 million in military aid to Ukraine authorized by Congress.