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In a statement, Lynne Tracy called Alexei Navalny “a strong voice that spoke bravely against corrosive corruption and represented hope for political change.”
About 400 Russians have been detained at gatherings for the campaigner.
Alexei Navalny's wife Yulia on Sunday wrote her first social media post ever since Russian President Vladimir Putin's critic and the country's key opposition leader died in prison, an incident which triggered widespread criticism of the government.
Alexei Navalny, 47, fell unconscious and died on Friday after a walk at the remote Arctic penal colony where he was serving a three-decade sentence, the prison service said.
US ambassador Lynne Tracy and Britain's Nigel Casey were pictured paying their respects at a memorial in Moscow.