President Donald Trump has signed into a law a bill which imposes new sanctions on Russia for their alleged meddling in the 2016 election.
The bill, which was signed in private at the White House, also imposes sanctions on Iran and North Korea.
The legislation "handcuffs" the president from easing penalties on Russia without congressional approval.
Russia denies interfering in the US election, and Mr Trump has denied colluding with Russia.
The White House had previously indicated that Mr Trump would sign the bill after it had passed through both houses of Congress.
But on Tuesday, US Secretary of State Rex Tillerson said he and the president are not "very happy" about the bill.
Russia has retaliated by ordering 755 people from the country's US embassy and consulates, after the financial sanctions package was passed by a group of cross-party lawmakers.
The sanctions passed by Congress came months after President Barack Obama expelled 35 Russian diplomats.
"We were clear that we didn't think it was going to be helpful to our efforts, but that's the decision they made," Mr Tillerson said on Tuesday, referring to lawmakers.
"They made it in a very overwhelming way. I think the president accepts that."
Republican Senator Lindsey Graham, praised the bill after it passed, pointing out that Mr Trump's options were limited since there were enough bipartisan votes to overcome a presidential veto.
"President Putin did something that nobody in America could do. He united the congress", he told CNN.
Senior Russian parliamentarian Konstantin Kosachev said that Mr Trump was "capitulating" by not facing off with Congress.
(Published by BBC - August 2, 2017)