South African officials on Friday hit back at U.S. accusations that a Russian ship had collected weapons from a naval base near Cape Town late last year, a move investors fear could lead Washington to impose sanctions.

The U.S. Ambassador to South Africa Reuben Brigety said on Thursday he was confident that a Russian ship under U.S. sanctions took aboard weapons from the Simon's Town base in December, suggesting the transfer was not in line with Pretoria's stance of neutrality in Russia's war against Ukraine.

Western diplomats were alarmed at South Africa carrying out naval exercises with Russia and China this year, and at the timing of a visit by Russian Foreign Minister Sergey Lavrov.