Why chemical weapons constitute a red line: 5 things to know

Russia thought to have sarin, VX, mustard gas and others in arsenal

20220325 Chemical weapon and Putin

If conventional methods stall in Ukraine, Russian President Vladimir Putin has two options, analysts say: humiliating retreat or escalation to weapons of mass destruction. (Source photos by Reuters and AP) 

KEN MORIYASU, Nikkei staff writer

TOKYO -- When U.S. President Joe Biden faced reporters Thursday at NATO headquarters in Brussels, the first question he received was on chemical weapons.

"Have you gathered specific intelligence that suggests that [Russian] President [Vladimir] Putin is deploying these weapons, moving them to position, or considering their use?" asked a reporter.

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