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MOSCOW – The Kremlin on Tuesday dismissed the White House’s warning that the Syrian government is preparing a new chemical attack and that President Bashar Assad and his military “will pay a heavy price” if it goes ahead.

President Vladimir Putin’s spokesman, Dmitry Peskov, said that “such threats to Syria’s legitimate leaders are unacceptable.”

WATCH ABOVE: U.S. warns Syria over potential chemical attack 1:05 U.S. warns Syria over potential chemical attack U.S. warns Syria over potential chemical attack

In a stern warning to Assad Monday night, the White House claimed it had detected activity resembling the buildup to a chemical weapons attack on April 4.

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READ MORE: White House says Assad preparing another chemical attack, warns he will pay ‘heavy price’

Assad has denied responsibility for that attack in the rebel-held Idlib province that killed dozens of people, and Russia, Assad’s key backer, sided with him. Days later, President Donald Trump ordered a retaliatory cruise missile strike on a Syrian government-controlled air base.

WATCH: Britain supports U.S. airstrikes if Syria uses chemical weapons

0:49 Britain supports U.S. airstrikes if Syria uses chemical weapons Britain supports U.S. airstrikes if Syria uses chemical weapons

Peskov criticized the Trump administration for using the phrase “another chemical weapons attack,” arguing that an independent investigation into the April attack was never conducted despite Russia’s calls for one.

“That is why we do not think it is possible to lay the blame on the Syrian armed forces,” Peskov said.

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WATCH: U.S. ambassador to the United Nations Nikki Haley said on Tuesday the Trump administration issued a warning to Syria over a possible chemical weapons attack

1:02 Nikki Haley says President Trump has served formal diplomatic warning to Syria Nikki Haley says President Trump has served formal diplomatic warning to Syria

Nikki Haley, the U.S. ambassador to the United Nations, warned in a Twitter post on Monday that “any further attacks done to the people of Syria will be blamed on Assad, but also on Russia & Iran who support him killing his own people.”

READ MORE: Canada announces sanctions against Assad regime following chemical attacks in Syria

Frants Klintsevich, first deputy chairman of the defence and security committee at the upper chamber of the Russian parliament, on Tuesday accused the United States of “preparing a new attack on the positions of Syrian forces.”