Kagame's comments clearly suggested that he wants South Africa to back off from DR Congo, where its military involvement dates back to the late 1990s. It first joined the UN's peacekeeping mission, Monusco, following the end of the racist system of apartheid in 1994.

President Paul Kagame said Rwanda was ready for "confrontation" as he rejected criticism over his backing for M23 rebels who were pushing south on Thursday in eastern Democratic Republic of Congo after capturing the major city of Goma.

South Africa often uses its diplomatic heft to position itself as defender of the "global south" on the world stage, but the deaths of 13 of its soldiers in eastern Congo fighting have exposed an inability to project hard power in its own backyard.