France, Britain and Germany warned Russia on Saturday that its demands to have its trade guaranteed with Iran risked the collapse of an almost-completed nuclear deal.

“Nobody should seek to exploit JCPOA [Joint Comprehensive Plan of Action] negotiations to obtain assurances that are separate to the JCPOA,” France, Britain and Germany — the so-called E3 European parties to the 2015 JCPOA accord with Iran — said in a joint statement, referring to Russia’s last-minute demands.