The Rwanda-backed militia’s decision followed European Union sanctions over three senior Rwandan military officials, five senior leaders of the M23, and a gold refinery announced earlier on Monday, as criticism grows of Kigali’s backing of the group that has seized two major Congolese cities.

Belgium, Rwanda’s former colonial ruler, pushed for the European Union to impose sanction against Rwandan officials over their role in invading eastern Congo and plundering its mineral wealth.

Rwanda-backed M23 rebels on Monday pulled out of peace talks with the Democratic Republic of Congo's government less than 24 hours before the warring parties in eastern Congo's worst conflict in decades were due to convene in Angola.