Tensions Mount On Ukraine's Frontline With Russian-Backed Separatists

ZOLOTE, UKRAINE - DECEMBER 12: A Ukrainian soldier, who goes by the nickname Chorny, stands outside his brigade's barracks on the front line on December 12, 2021 in Zolote, Ukraine. A build-up of Russian troops along the border with Ukraine has heightened worries that Russia intends to invade the Donbas region, most of which is held by separatists after a 7-year-long war with the Ukrainian government. On Tuesday, U.S. President Joe Biden met with Russian President Vladimir Putin via video conference to discuss the escalation tensions. (Photo by Brendan Hoffman/Getty Images)