There's opposition from some EU countries to sanctions against Russia. Hungary and Slovakia for instance still depend on Russian oil gas, and are blocking or delaying sanctions. Other countries import Russian gas https://www.financial-world.org/news/news/financial/28200/hungary-and-slovakia-oppose-eu-sanctions-aiming-to-halt-russian-energy-imports/

This dependance on fossil fuel is putting the EU in a terrible situation where it imports from its agressor. Those billions of import contribute to Russia's budget and war effort.

Reducing import and reliance on fossil fuel from Russia, or elsewhere, is as important as helping Ukraine defend itself.

They're probably worried that Krasnov might be forced by his patron to intervene if they do.