US accuses South Africa of supplying arms to Russia, tensions rise.

South Africa has summoned the US ambassador after he claimed that South African weapons were loaded onto a Russian vessel that docked at a Cape Town naval base in December. The South African government has said it will investigate the matter, but the US ambassador's remarks have "undermined" the relationship between the two nations. The US and South Africa have long been friendly nations, but the accusations have put relations at their lowest ebb in years.