This was revealed in a confidential report by a group of United Nations (UN) experts.

The report obtained by Reuters details training which the experts say Rwanda has provided to M23 recruits and military equipment they say Rwanda has deployed, notably "high-tech systems capable of neutralizing air assets", to give the rebels "a decisive tactical advantage" over the DRC's beleaguered army.

The report was submitted to the UN Security Council sanctions committee for the DRC in early May and is due to be published shortly, said diplomats.

M23 has advanced in eastern DRC, seizing the region's two largest cities, Goma and Bukavu, in January and February. The DRC, the United Nations and Western powers say Rwanda is supporting M23 by sending troops and arms.

Rwanda has long denied helping M23 and says its forces are acting in self-defense against Congo's army and ethnic Hutu militiamen linked to the 1994 Rwandan genocide, including the Democratic Forcesfor the Liberation of Rwanda.

--Reuters--