Russia has hit out at Britain for bringing other European Union countries into the dispute over the killing in London of Kremlin critic Alexander Litvinenko.

Speaking ahead of Wednesday’s G8 summit in Germany – the first meeting between Russia’s President Vladimir Putin and Tony Blair, the British prime minister, since the killing of the former KGB agent – Yuri Fedotov, Russia’s ambassador to Britain, accused London of using “megaphone diplomacy” in the matter.