Two ways:
- The attack was right off the coast of Türkiye. If this were an attack from UA (which it isn't), Türkiye could claim that UA attacks were putting Türkiye's shipping, commerce, and its civilians at risk and Türkiye being a NATO member, that would carry a lot of weight. Russia wanted the idea "if another country's cargo carrier is being attacked by UA, then UA should be stopped from attacking ships".
- UA has been specifically targeting Russia's petroleum carriers, not agribusiness, which could have nutrition connotations. Russia claimed it was carrying sunflower oil, not petroleum. So Russia would try to claim that food shipments for the nation of Georgia were being attacked by UA, and that the UA attacks on ships should be stopped by NATO allies.
Russia desperately wants the attacks on it main economic lifeline, cargo ships, to end as soon as possible.