WASHINGTON — The Trump administration took a tougher tone on Russia Thursday, signing on to a statement sharply criticizing Moscow for allegedly orchestrating a chemical weapons attack against an ex-Russian spy in the U.K., and issuing long-awaited sanctions against Russian "cyber actors" for interference in the 2016 U.S. election.

The new sanctions — against five entities and 19 individuals — come amid criticism that President Donald Trump had failed to firmly confront and aggressively counter alleged Russian attacks on allied soil and continued efforts to destabilize U.S. politics.

The sanctions, while new from the Treasury Department, overlap with previous steps taken by the U.S., including naming all 13 Russians previously indicted by Robert Mueller for 2016 election meddling. The president has previously sought to delegitimize Mueller's investigation as a "witch hunt" and called claims that his campaign colluded with Russia "phony."

On a call with reporters Thursday a senior national security official called the sanctions "just one of a series of ongoing actions we’re taking to counter Russian aggression."

"There will be more to come," said the official, who briefed reporters on condition of anonymity and offering no further specifics.

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Speaking to the disinformation campaign that Russia employed during the 2016 U.S. election, another senior national security official advised that propaganda disinformation campaigns "lose their effect if the American people are aware of foreign actors attempting to manipulate them."

The Russian Embassy in Washington, D.C. Chris Kleponis / AFP/Getty Images

That awareness could be bolstered by the president, who has been reluctant to speak out at length about Russia's involvement in the 2016 election. An official demurred when asked if Trump would speak out as part of these stepped up efforts.

Trump himself ignored a question about the new sanctions Thursday during a short press availability in the Oval Office. He did respond to a question on the U.K. attack, saying it "certainly looks like the Russians were behind it."

The president begrudgingly signed a bill last year that imposed sanctions on Russia, pressured by his Republican Party not to move on his own toward a warmer relationship with Moscow in light of Russian actions during the 2016 elections. Trump called the bill “seriously flawed — particularly because it encroaches on the executive branch’s authority to negotiate.”

The sanctions announcement came shortly after the release of a joint statement from the U.S., the U.K., Germany, and France on Thursday morning in which the U.S. said it shared British assessments "that there is no plausible alternative explanation" to the military-grade nerve agent attack on former Russian spy Sergei Skripal and his daughter, adding that "Russia's failure to address the legitimate request by the government of the United Kingdom further underlines Russia's responsibility."

The White House's tough response on the chemical attack comes after an initially tepid one from the briefing room lectern on Monday. Asked if the Trump administration shared the U.K.'s assessment that Russia was behind the attack, Press Secretary Sarah Huckabee Sanders offered "the fullest condemnation" of the "reckless, indiscriminate and irresponsible" act — falling short of saying Russia was definitely behind it.

Just hours before his surprise firing-via-Twitter, outgoing Secretary of State Rex Tillerson broke with the administration on the issue, telling reporters traveling with him on an overseas trip that the poisoning attack "clearly came from Russia" and "certainly will trigger a response."

The administration's response evolved by midweek, however, culminating in a forceful and direct statement from Ambassador Nikki Haley at the United Nations Security Council in New York in which she said "the United States believes that Russia is responsible for the attack on two people in the United Kingdom using a military-grade nerve agent." She also voiced the "absolute solidarity" of the U.S. with Britain after the U.K.'s decision to expel 23 Russia diplomats in response to the chemical attack.

As the U.S. recognized elaborate Russian efforts to spread misinformation and meddle in the 2016 U.S. election, officials also said Russia targeted U.S. energy, nuclear, water, aviation, commercial facilities, and key manufacturing sectors since May of 2016 — managing to gain access to the grids of some of these sectors.

A senior national security official told reporters Thursday that the government assisted victims and stopped further attempts at access.

The Department of Homeland Security and the FBI said the activity was part of a “a multi-stage intrusion campaign by Russian government cyber actors."