WATCH: Nikki Haley Issues Warning About Potential Russian Attack On U.S.

On Wednesday, United States Ambassador to the United Nations Nikki Haley warned that Russia could potentially use chemical weapons in New York City the same way they allegedly tried to assassinate a former spy and his daughter in the U.K. using a military grade nerve agent.

“If we don't take immediate concrete measures to address this now, Salisbury will not be the last place we see chemical weapons used,” Haley told the U.N. Security Council. “They could be used here in New York, or in cities of any country that sits on this Council. This is a defining moment.”

Haley's statement came after "United Kingdom Prime Minister Theresa May ordered the expulsion of 23 Russian diplomats, a halt to meetings with top Russian officials and the cancellation of an upcoming visit by Russian Foreign Minister Sergei Lavrov in retaliation for the March 4 nerve agent attack in Salisbury on former spy Sergei Skripal and his daughter, Yulia," the Free Beacon reported.

"The United States believes that Russia is responsible for the attack on two people in the United Kingdom, using a military-grade nerve agent. Dozens of civilians and first responders were also exposed," Haley continued. "Our thoughts and prayers go out to the victims of this atrocious crime."

"A growing concern in all of this dangerous and destabilizing activity is Russia," Haley said on Russia's recent actions. "Russia failed to ensure Syria destroyed its chemical weapons program. Russia killed the joint investigative mechanism when it found [Bashar] Assad liable for chemical attacks. Russia used its veto to shield Assad five times last year."

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