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The new leader of the United Kingdom’s army said that Russia is a bigger security threat than the Islamic State group (ISIS) in his first interview since becoming chief in June.

“Russia today indisputably represents a far greater threat to our national security than Islamic extremist threats such as al-Qaida and [ISIS],” Gen. Mark Carleton-Smith told the Daily Telegraph.

“Russia has demonstrated that it is prepared to use military force to secure and expand its national interest.”

Russia has come under scrutiny this year for allegations by the British government that it is behind the May poisoning of former Russian spy Sergei Skripal in the town of Salisbury. The U.K. says Russia used a highly toxic nerve agent called Novichok to carry out the attack, which left Skripal and his daughter critically ill.

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Skripal recovered, but a British woman died from coming in contact with the substance. Russia has denied any involvement in the poisoning.

“Russia has embarked on a systematic effort to explore and exploit Western vulnerabilities,” Carleton-Smith said. “Particularly in some of the non-traditional areas of cyberspace, undersea warfare.

“The Russians seek to exploit vulnerability and weakness whenever they detect it.” Tweet This

Carleton-Smith led the U.K.’s military hunt for al-Qaida leader Osama bin Laden, and between 2012 and 2015 was head of the British Special Forces. He has spent the last two decades focused on fighting Islamic extremism.

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He says the threat from ISIS has diminished due to military action from the U.S.-led coalition in Syria and Iraq.

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He went on to reinforce the importance of NATO in countering Russia.

“The most important conventional military response to Russia is the continued capabilities and coherence of the NATO alliance,” he said. “I would not support any initiative that diluted the military effectiveness of NATO.

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“We cannot be complacent about the threat Russia poses or leave it uncontested.”

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U.S. President Donald Trump has consistently criticized the military alliance since his election, claiming the U.S. is paying too much into NATO and is being exploited by allies.

The Russian U.K. embassy responded by poking fun of Carleton-Smith’s comments on Twitter.

Army chief doesn't care about Isil? Great global strategic vision! pic.twitter.com/bJNEoCK1qw — Russian Embassy, UK (@RussianEmbassy) November 24, 2018