Foreign Secretary Dominic Rabb has urged Moscow to "tell the truth" about the poisoning of Alexei Navalny, saying it is "absolutely unacceptable" the Russian opposition leader was poisoned by the same nerve agent deployed in Salisbury. Rabb said on Wednesday that Russia has "a clear case to answer" after the German government said the Kremlin critic was targeted with Novichok in an attempted murder. Britain has long accused Russian operatives of using the Soviet-era poison against Sergei