South Africa's government insists it will allow a Russian oligarch to dock his superyacht in Cape Town, despite calls from the city's mayor to bar it.

The vessel, which is on its way from Hong Kong, belongs to Alexei Mordashov, an ally of Russia's Vladimir Putin who has been sanctioned by the EU and US.

The South African government has said it is not bound by the sanctions.

But Cape Town's mayor said he has a "moral duty" to oppose Russia's "unjust war" on Ukraine and has vowed to block the yacht.

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