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Russian Defense Minister Sergei Shoigu called his counterparts in the UK, France and Turkey warning of a drift toward “uncontrolled escalation” in Ukraine and the potential for Kyiv to detonate a radioactive “dirty bomb.” The US called the allegation “transparently false” as Shoigu and US Secretary of Defense Lloyd Austin spoke for the second time in three days. Austin’s office “rejected any pretext for Russian escalation.”