Biden administration officials have assessed that Russian President Vladimir Putin may use chemical weapons in Ukraine first before resorting to a nuclear confrontation with NATO if his troops continue to lose ground. Ukrainian State Emergency Service firefighters work to extinguish a fire at the scene of a Russian shelling in the town of Vyshgorod outside … Continue reading U.S. concerned Russia could use chemical weapons in Ukraine . Officials do not believe there is an imminent threat, but they say Moscow could use the weapons if it continues to lose ground in Ukraine.