Britain today provoked Russia's wrath by directly implicating Vladimir Putin in the nerve agent attack on an ex-double agent, with the Kremlin saying the claims were "shocking and unforgivable."
Earlier this week the Kremlin indicated it would expel British diplomats in response to London's move as well as adopt other measures that would "most suit Moscow's interests."
Meanwhile the Investigative Committee, which reports to Putin, opened a probe into the "attempted premeditated murder" of Skripal's daughter, a Russian national, which it said had been "carried out in a way that was dangerous to the public."
Putin has barely weighed in on the row, telling a BBC reporter this week: "Sort things out from your side and then we will discuss this with you."