Allegations that one of its senior military officers spied for the Kremlin prompts Austria's foreign minister to cancel a planned trip to Russia
Minister accused of security breach by taking his government phone to Iran.
Man is held at airport accused of accepting hundreds of thousands of dollars for information.
Russia to expel 60 US diplomats and close Washington's St Petersburg consulate - Russian FM Sergei Lavrov
Foreign Minister Sergei Lavrov says Russia will retaliate.
Retired weapons scientist warns no cure for debilitating agent that can kill with the slightest trace.
Spymaster speaks to Euronews
Police extend their investigation and evidence gathering quickens into double poisoning.
State TV news presenter Kirill Kleimenov said: "The profession of a traitor is one of the most dangerous in the world," and that traitors rarely live a long and peaceful life.