The US was considering imposing more sanctions on Russia and the decision will be made "in the near future", White House has said.
"We are considering additional sanctions on Russia and a decision will be made in the near future," said White House Press Secretary Sarah Sanders in a statement on Monday, Xinhua news agency reported.
The announcement came one day after a senior US official revealed that Washington was preparing to roll out a new round of sanctions on Moscow as early as Monday for its support of the Syrian government.
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Nikki Haley, the US ambassador to the United Nations, said on Sunday that new sanctions, if they were ready, will be announced on Monday by US Treasury Secretary Steven Mnuchin.
"They will go directly to any sort of companies that were dealing with equipment related to (Syrian President) Bashar al-Assad and chemical weapons use," Haley said.
The Trump administration has already slapped two rounds of sanctions on Russia in the past few weeks, citing their alleged interference in the 2016 US elections and the engagement in "malicious" cyber attacks.
Washington-Moscow ties kept deteriorating over the suspected chemical weapons attack in Syria on April 7, as US President Donald Trump accused Russia, along with Iran, for their support of the Assad administration in Syria, whom Washington said should be responsible for the deadly incident.
The US, Britain and France on Saturday launched missile strikes in Syrian capital Damascus and the central province of Homs to retaliate for the Syrian government's alleged use of chemical weapons in a rebel-held district east of Damascus last week.
The Syrian government has strongly denied the allegation, calling for the Organization for the Prohibition of Chemical Weapons to send a fact-finding mission for investigations.
On Sunday, Russian President Vladimir Putin and his Iranian counterpart Hassan Rouhani condemned the airstrikes over phone, agreeing that the "illegal action seriously damages the prospects for a political settlement" in the war-torn country, according to a Kremlin statement.
"Putin in particular stressed that if such actions, carried out in violation of the UN Charter, continue, it will inevitably lead to chaos in international relations," the statement said.
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