Johannesburg, South Africa CNN —The US ambassador to South Africa on Thursday accused the South African government of delivering arms and ammunition to a sanctioned Russian cargo vessel late last year, local media said. In response to the ambassador’s claims, South Africa has summoned Brigety to Pretoria. South African Foreign Minister Naledi Pandor would also speak to her US counterpart, Secretary Antony Blinken, about the matter, he added. The South African presidency called the explosive allegations “disappointing” and warned that the remarks “undermine the spirit of cooperation and partnership” between the US and South African government officials who had been discussing the matter. Later this year, South Africa will host the BRICS summit, a grouping of Brazil, Russia, India, China, and South Africa.