Researchers say troops’ brains may be injured by blasts from firing M1 Abrams tank guns and other weapons, even if they measure below the Pentagon’s ceiling for safe exposure.
The fight for the battered city of Avdiivka has emerged this fall as the fiercest battle of the war. Waves of Russian assaults have not broken through so far.
The Ukrainian leader’s second trip to America comes at a more delicate diplomatic moment, as he tries to navigate political currents while expressing gratitude for Western support.