DONETSK OBLAST — Walking through the mine-infested field under intense Russian drone surveillance was the scariest part of the mission for 22-year-old infantryman Mykola. "If you stop, you die," said Mykola, a small-framed soldier with dark circles under his eyes and a tired stare. "When we were walking to get to the positions, it wasn't hard to walk — it was hard to realize that you may not walk out alive because there were a lot of our dead around." The walk to his positions near the easter