The Ukrainian government has pleaded with the world’s biggest commodity traders to stop handling Russian oil.

Oleg Ustenko, economic adviser to president Volodymyr Zelenskyy, has written to Vitol, Trafigura, Glencore and Gunvor to demand an end to hydrocarbon trading, the Financial Times reported.

This is an attempt to further choke off Russian revenue being used to fund the war in Ukraine.

The traders have continued to ship Russian crude since the invasion and say they are fulfilling legally binding contracts so long as the deals are not sanctioned.