Russian Prime Minister Dmitry Medvedev has said new sanctions imposed by the US are tantamount to declaring a “full-scale trade war” against Moscow.
He said the measures, signed by Donald Trump, demonstrated the complete impotence of the US president, who he said had been humiliated by Congress.
The law aims to punish Russia for its alleged meddling in the 2016 US elections and its actions in Ukraine.
Mr Trump accused Congress of overreach on the legislation.
In signing the Countering America’s Adversaries Through Sanctions Act on Wednesday, he attached a statement calling the measure “deeply flawed”.
The legislation limits the amount of money Americans can invest in Russian energy projects, and makes it more difficult for US companies to do business with Russia.
It also imposes sanctions on Iran and North Korea.
Iran said the new sanctions violated the nuclear deal and it would respond in an “appropriate and proportional” manner, reports the semi-official Isna news agency.
North Korea has so far made no public comments on the US move.
Writing on his Facebook page on Wednesday, Mr Medvedev said the sanctions package “ends hopes for improving our relations with the new US administration.
“The sanctions regime has been codified and will remain in effect for decades unless a miracle happens.”
Mr Medvedev also warned that the US Congress would take new steps aimed at removing President Trump – whom he described as a “non-systemic player” – from power.
Moscow – which denies interfering in the US presidential election – had already retaliated last week when Congress passed the bill by ordering the US to cut to 455 the number of staff at the US embassy and consulates in Russia – a reduction of 755 people altogether – and also by denying access to a US country house and a warehouse in Moscow.
Several European nations, including Germany, had been fearful of the economic consequences but European Commission President Jean-Claude Juncker expressed satisfaction over what he described as the softening of the bill after the EU had expressed its concerns.
“Moreover, the US Congress has now also committed to only apply sanctions after the country’s allies are consulted. And I do believe we are still allies of the US,” he said.