The United States on December 23 voiced deepening concern over the fate of imprisoned Russian opposition leader Aleksei Navalny, who has not been heard from since early December. "We are deeply concerned about the whereabouts of Alexei Navalny, who has now been missing in Russia's prison system for nearly three weeks," Secretary of State Antony Blinken said on social media platform X. "We once more call for his immediate release and an end to the continued repression of independent voices in Russia."