Haley, the Administration's most prominent diplomatic voice until a new secretary of state is confirmed, said the new round of sanctions will target Russian firms that have helped the government of Syrian President Bashar al-Assad make and deploy chemical weapons. A suspected chemical weapons attack on April 7 spurred the United States and its allies to launch more than 100 missiles at Syria over the weekend.
Treasury Secretary Steven Mnuchin "will be announcing those [sanctions today], if he hasn't already," Haley said.
Haley has been one of the strongest voices accusing Russia of enabling the Syrian government in its use of chemical weapons in the civil war, which is now in its seventh year.
Russia has vetoed at least six resolutions in the UN Security Council regarding chemical weapons.
The Russian vetoes have been one of the main irritants in strained relations between Washington and Moscow, with Western diplomats accusing Russia of trying to protect the Assad Government.
Haley spoke two days after the United States, France and Britain struck at three facilities that the Administration called the "heart" of Syria's chemical weapons programme. But it is unclear how much capacity Syria retains to produce chemical weapons and whether the strikes chipped away at the Government's political will to deploy them.
The strikes suggest that, for now, the White House has no intention of withdrawing 2000 US troops currently in Syria, as Trump suggested on April 4 that he intends to do.