British Foreign Secretary Jeremy Hunt says Russia that "the price will be too high" if it continues to act against international norms. He said in an interview with Sky News.
Hunt suggested Moscow will be wondering whether the Salisbury chemical weapons attack was "a smart thing to do."
Speaking to The Kay Burley Show in New York, he revealed his "frank exchange of views" with Russian counterpart Sergey Lavrov, during a "pretty tough" meeting at the UN General Assembly.
One of the Russian men accused of the Salisbury poisonings has recently been exposed as a military officer who received an honor from his country's president, Vladimir Putin.
"It is not acceptable for Russia to instruct two GRU agents to use chemical weapons on British soil, the first time it's ever happened,” Hunt said.
"This is a very significant thing and the significance isn't about bilateral spats between Russia and the UK. We have international norms where you don't use chemical weapons.
"Our message for Russia is very straightforward: If you do this, the price will be too high."
The Organisation for the Prohibition of Chemical Weapons confirmed Britain’s conclusions that ex-GRU officer Sergei Skripal was poisoned with the nerve agent.
Ex-colonel of Russia’s GRU, Chief Intelligence Department, Sergey Skripal and his daughter Yulia, poisoned in the center of Salisbury town in the evening of March 4, are still struggling for life in the intensive care unit of the local hospital. The British special services suppose that Skripal and his daughter were poisoned by his ex-colleague Andrey Lugovoy, who acted on orders from Moscow.
Earlier, MI6, the British secret intelligence, recommended that former GRU colonel Sergei Skripal and his daughter Yulia change identities and move the U.S. to avoid any new assassination attempts. This was decided after negotiations between MI6 and their counterpart from the CIA.