The M23 pressed onwards in the eastern Democratic Republic of Congo on Saturday, even as Washington vowed action over its Rwandan backers' violation of a US-brokered peace deal.

Top US diplomat Marco Rubio said Saturday that Rwanda had clearly breached the agreement it signed with the DRC in Washington last week, the latest attempt to end the grinding three-decade-long conflict upending the mineral-rich Congolese east.

The deal -- hailed by US President Donald Trump as a "miracle" -- was inked on December 4. Just says later, the Rwandan-backed M23 seized the key frontier city of Uvira along the border with Burundi, raising fears of the conflict breaking out into a regional war.

The M23's capture of Uvira -- a city of several hundred thousand people -- allows it to control the land borde

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