MOSCOW (Sputnik) — Earlier in the day, the British inquiry blamed Litvinenko’s death on Russian authorities but could not conclude that the polonium-210 used to poison the former agent had come from Russia. The Russian Foreign Ministry claimed that the inquiry was politicized and overshadowed Moscow-London relations.
"In the light of the inquiry's findings, we are considering what further action we should take," Cameron's spokesperson said, as quoted by the ITV television channel.
Following his death, UK authorities claimed that Litvinenko's former colleagues had poisoned him with the radioactive isotope polonium-210. A public inquiry into Litvinenko's death was formally established by the UK government in July 2014.
Earlier, Lugovoy said that he had passed a polygraph test conducted by the British experts that had proved him innocent in the case.