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Nick Eardley, Matt Murphy & Joshua CheethamBBC VerifyPA MediaThe Royal Navy released images of the Sparta II (centre) as it moved through international waters in late December, before arriving in SyriaRussia has stepped up its military withdrawal from Syria, removing vehicles and containers from its key Tartous port on the country's Mediterranean coast, analysis by BBC Verify suggests.After the fall of the Assad regime in December, verified footage showed columns of Russian vehicles moving north towards the port. Satellite images subsequently showed military hardware being stored there.But new images published on Wednesday by Planet Labs showed that much of the