At least 10 dead in the U.S. after deadly flooding followed by extreme cold as polar vortex grips many states, including Kentucky and parts of the Southeast.
Read moreSupporters of Alexei Navalny commemorate his death with memorials in Moscow, risking reprisals under Russia's harsh regime.
Read moreA major winter storm is set to blanket the Northeast with snow and ice, impacting travel and bringing challenging weather conditions for millions.
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