The U.S. government announced new sanctions against Russia on Thursday.

The measures are in response to the death of Russian journalist Alexei Navalny. The death of Navalny, who was found dead on February 16, has been ruled a natural death. The Russian government has denied any involvement in the death, calling it a political assassination. The United States and the European Union have agreed on a 13th round of sanctions against Russian entities, including the state-owned oil giant Rosneft, to be announced on Friday.