The United Kingdom’s foreign minister said the poisoning of a former Russian spy “leads inexorably to the Kremlin,” The Associated Press reported Sunday.

Boris Johnson also reportedly said he holds evidence that Russia has been amassing nerve agents that it could use for possible assassination attempts.

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“[T]hey have been producing and stockpiling Novichok, contrary to what they have been saying,” said Johnson, as reported by the AP.

The Trump administration has agreed with the U.K.'s finding blaming Russia for the poisoning of Sergei Skripal and his daughter, Yulia, in the United Kingdom.

“Russia must fully cooperate with the U.K.'s investigation and come clean about its own chemical weapons program," U.S. Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE said last week.

Russia has denied any part of Skripal’s poisoning. But British Prime Minister Theresa May last week banished 23 Russian diplomats in response, according to The New York Times.

The United Kingdom's National Security Council will gather this week to talk about additional actions, Johnson said, according to the AP.