Russian President Vladimir Putin on Saturday visited Crimea to mark the ninth anniversary of the peninsula's annexation, a day after the International Criminal Court issued an arrest warrant against him over the Ukraine conflict.

Turkey meanwhile announced the extension of a deal that has allowed Ukraine to export grain following Russia's offensive, but Kyiv and Moscow disagreed if the agreement was prolonged for 60 or 120 days.

Putin's surprise visit to Crimea was his first to the peninsula since he sent troops to Ukraine on February 24 last year, apart from when he drove across the bridge linking the territory to mainland Russia last December.

He was shown visiting the Black Sea port city of Sevastopol, accompanied by the local Moscow-appointed governor Mikhail Razvozhayev, according to images broadcast by Russian state TV.

Razvozhayev said on the messaging app Telegram that Putin had been expected to take part in the opening of a children's art school by video link.