The West should impose full sanctions on big Russian energy firms including Gazprom, Gazpromneft, Rosneft, Surgutneftegaz, Lukoil, Tatneft, Transneft, Sibur, Zarubezhneft and Novatek, the group said. Any Western oil and gas companies remaining in Russia should face a 100% tax on benefits derived from their Russian operations, while Western oil field services should be blocked for Russia. The West should impose an embargo on all Russian iron and steel as well as its diamonds and jewelry, the group said, while tougher sanctions should be imposed on all major Russian banks.