Sberbank has taken legal action to recover debt and penalties from Glencore Energy UK Ltd over the two consignments, supplied by a subsidiary of Russia's largest bank in March.
Ghanaian President Nana Akufo-Addo caused a controversy by stating last week that Burkina Faso had hired mercenaries from Russia's Wagner group to help it fight Islamist militants.
The goal of a mineral supply agreement is that countries that have limited access to the raw materials needed to transition to a green economy are not left behind.