After the meeting with his Russian counterpart, UK foreign secretary David Miliband insisted the UK`s continued demand for the extradition of the main suspect in the killing would not block co-operation with Russia on other issues. Moscow still refuses UK requests to extradite Andrei Lugovoi - the chief suspect on the murder in London of Russian emigre Alexander Litvinenko Pictured: member of Russian Parliament Andrei Lugovoi (r)and Russian businessman Dmitry Kovtun (l)in Moscow (Dmitry Kovtun is also involved in the Alexander Litvinenko spy case).