Tories took £1.25m from oligarch's firm after he was sanctioned in wake of Russia's Ukraine invasion

Tom Keatinge, Director of the Centre for Finance and Security at the thinktank RUSI, said: “Ukraine’s sanctioning of Blavatnik does not have legal standing in the UK, however concerns have been raised about money with connections to Russia and the former Soviet Union and thus regardless of the legal position, accepting such donations is ill judged at best.”