French President Emmanuel Macron has called for tougher action against Russia's so-called shadow fleet and measures to make it more difficult for Moscow to import key commodities.
The shadow fleet refers to a network of often ageing and obscurely owned vessels used by Russia to transport oil and other goods while circumventing Western sanctions imposed over the war in Ukraine.
Macron proposed holding a ministerial meeting within the next few weeks "dedicated to fighting the shadow fleet, to make sure we are acting wherever possible."
France has previously detained several oil tankers it accuses of belonging to the shadow fleet and helping generate revenue for Moscow's war economy. The coalition has also pledged more coordinated action against such vessels.
Macron, speaking by video to a meeting of the Coalition of the Willing in Kiev, also called for sanctions to prevent exports of gas, oil and diesel to Russia.
Russia had not previously imported these commodities but was now doing so, Macron said. While it would probably not be possible to exert pressure on countries such as Belarus, some of the supplies were reaching Russia through Swiss companies, he added.
Macron also said a planned exercise by the Coalition of the Willing in Poland would take place in October and November.
The coalition is a group of countries supporting Ukraine that is working on long-term security guarantees for the country, including plans for a multinational force that could operate in Ukraine once hostilities have ended.
The exercise would demonstrate that the coalition was ready to deploy and capable of taking action once hostilities had ended, Macron said.