Rwanda's actions in eastern Democratic Republic of Congo clearly violate the peace deal signed in Washington under US President Donald Trump, Secretary of State Marco Rubio said on Saturday in the latest US admonition to the East African country.

"Rwanda's actions in eastern DRC are a clear violation of the Washington Accords signed by President Trump, and the United States will take action to ensure promises made to the President are kept," Rubio said in an X post.

At the United Nations on Friday, the US accused Rwanda of fueling instability and war as an offensive of the M23 rebel group in eastern Democratic Republic of Congo threatens to derail US efforts to broker peace in the region.

Rwanda has repeatedly denied backing the M23 armed group and rejects accusations that it is involved in the conflict in eastern DR Congo.

The leaders of the Democratic Republic of Congo and Rwanda signed a peace deal in Washington on December 4 even as fighting continued in their war-scarred region.