The Biden administration sanctioned seven mid- and senior-level Russian officials on Tuesday, along with more than a dozen businesses and other entities, over a nearly fatal nerve-agent attack on opposition leader Alexei Navalny and his subsequent jailing.

The measures, emphasizing the use of the Russian nerve agent as a banned chemical weapon, marked the Biden administration’s first sanctions against associates of President Vladimir Putin. The Russian leader was an intimate and favorite of President Donald Trump even amid covert Russian hacking and social media campaigns aimed at destabilizing the U.S.

The government officials included at least four whom Navalny’s supporters had directly asked the West to penalize, saying they were most involved in targeting him and other dissidents and journalists. However, the U.S. list did not include any of Russia’s most powerful businesspeople and bankers, oligarchs whom Navalny has long said the West would have to sanction to get the attention of Putin.

Tuesday’s step “was not meant to be a silver bullet or an end date to what has been a difficult relationship with Russia,” White House press secretary Jen Psaki said. “We expect the relationship to continue to be a challenge. We’re prepared for that.”

The Biden administration also announced sanctions under the U.S. Chemical and Biological Weapons Control and Warfare Elimination Act for businesses and other enterprises, most of which it said were involved in the production of biological and chemical agents.

The U.S. intelligence community concluded with high confidence that Russia’s Federal Security Service used the Russian nerve agent Novichok on Navalny last August, a senior administration official said.

Russia critic Bill Browder, a London-based investor, tweeted that he feared the new U.S. sanctions would be “way too little and not touch Putin’s billionaire cronies.”

Rep. Adam Schiff, a California Democrat and chair of the House Intelligence Committee, called the U.S. move overdue.

Working with U.S. allies, “we must use an array of tools, including sanctions, to meaningfully deter, repel, and punish Moscow’s transgressions,” Schiff said in a statement.

The Biden administration has pledged to confront Putin in alleged attacks on Russian opposition figures and in alleged malign actions abroad, including the hacking of U.S. government agencies and U.S. businesses. Trump spoke admiringly of Putin and resisted criticism of Putin’s government. That included dismissing U.S. intelligence findings that Russia had backed Trump in its covert campaign to interfere with the 2016 presidential election.

The administration coordinated the sanctions with the European Union, which added to its own sanctions Tuesday over the attack on Navalny.

The U.S. and European shared concerns about “Russia’s deepening authoritarianism,” Secretary of State Antony Blinken said.

“The U.S. government has exercised its authorities to send a clear signal that Russia’s use of chemical weapons and abuse of human rights have severe consequences,” Blinken said in a statement.

The individuals sanctioned by the U.S. included the head of Russia’s Federal Security Service, the head of prisons, Kremlin and defense figures, and Russia’s prosecutor general.

The Biden administration had forecast for weeks actions against Russia. Besides the Navalny sanctions, officials have said the administration plans to respond soon to the massive Russian hack of federal government agencies and private corporations that laid bare vulnerabilities in the cyber supply chain and exposed potentially sensitive secrets to elite Kremlin spies.

Navalny, 44, was sickened by the Russian nerve agent in an attack that the United States and others linked to Putin’s security services. After months of recuperation in Germany, Navalny flew home to Moscow in January and was arrested on arrival for an alleged parole violation.

His detention sparked street protests across Russia. Police arrested thousands of demonstrators. Authorities have transferred the opposition leader to a penal colony to begin serving a sentence, after what rights groups said was a show trial.

Long a target in Russian government attempts to shut down dissent, Navalny has repeatedly appealed to the West to start targeting the most powerful business and financial oligarchs of his country, saying only then would Russian leaders take international sanctions seriously.

The U.S. government has previously censured behavior by Russia that American officials saw as having violated international norms.

In 2016, for instance, the Obama administration responded to interference by the Kremlin in the presidential election by expelling dozens of Russian diplomats who officials said were actually spies and by shuttering two Russian compounds in Maryland and New York.

Trump’s administration also took a handful of actions adverse to Moscow, including through the closure of Russian consulates on the West Coast and the suspension of a nuclear arms treaty.

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Associated Press writers Eric Tucker in Washington and Lorne Cook in Brussels contributed to this report.