MOSCOW, December 22. /TASS/. London is refusing to contact with Russia’s Federal Security Service (FSB) over the murder case of ex-KGB agent Alexander Litvinenko, and this is an obstacle for real anti-terror cooperation, Russian Foreign Minister Sergey Lavrov said after talks with UK Foreign Secretary Boris Johnson on Friday.

"Truly effective cooperation in the anti-terror fight is now stalled over the decision of the British government to stop all contacts with the FSB, which was made in connection with the so-called Litvinenko affair," Lavrov said.

"Without full-fledged contacts with the FSB, which as I’ve already said, London is dodging, it is difficult to expect any success in this field," Lavrov noted.