David Cameron

The murder of Alexander Litvinenko in London in 2006 remains a stumbling block between Great Britain and Russia. The killing subsequently led to a number of tit for tat diplomatic expulsions.
 
Earlier that year, in March, myself and a colleague were introduced to Litvinenko by Oleg Gordievsky, former deputy head of KGB. Litvinenko provided information that enabled London MEP Gerard Batten to expose Romano Prodi as a former KGB "asset". I have subsequently taken a personal interest in this killing, which Batten described, quite rightly, as "an act of war".