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Ukraine war

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

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

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 | Russia & Caucasus

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

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