Fears of a radioactive "false flag" have sparked a rare flurry of phone calls between Washington and Moscow and between the U.S. and its allies as they warn the Kremlin against nuclear escalation.
Why it matters: Kyiv and Washington have both rejected the "absurd" claims from top Russian officials and state media that Ukraine intends to detonate a "dirty bomb" on its own soil. But both have noted that Moscow often accuses others of what it intends to do itself.
