The United States levied new sanctions Monday on seven Russian government officials, as well as 17 companies with links to Vladimir Putin's close associates, as the Obama administration seeks to pressure the Russian leader to deescalate the crisis in Ukraine.

The U.S. sanctions were implemented in coordination with the European Union, which moved to slap visa bans and asset freezes on 15 individuals alleged to be involved with stoking instability in eastern Ukraine.

The new penalties were a response to what the West says is Russia's failure to live up to commitments it agreed to under an international accord aimed at ending the dispute. The White House says Russia's involvement in the recent violence in eastern Ukraine is indisputable and warned that the U.S. and its partners were prepared to impose deeper penalties if Russia's provocations continue.

President Barack Obama announced the U.S. sanctions while traveling in the Philippines, the last stop on a weeklong trip to Asia. He said that while his goal was not to target Putin personally, he was seeking to "change his calculus with respect to how the current actions that he's engaging in could have an adverse impact on the Russian economy over the long haul."

Among the targets of the new sanctions is Igor Sechin, the president of state oil company Rosneft, who has worked for Putin since the early 1990s. Sechin was seen as the mastermind behind the 2003 legal assault on private oil company Yukos and its founder Mikhail Khodorkovsky, who at the time was Russia's richest man. The most lucrative parts of Yukos were taken over by Rosneft, making it Russia's largest company. Rosneft has a major partnership deal with ExxonMobil.

In addition to the new sanctions, the U.S. is adding new restrictions on high-tech materials used by Russia's defense industry that could help bolster Moscow's military.

Obama has been building a case for this round of penalties throughout his trip to Asia, both in his public comments and in private conversations with European leaders. The new sanctions are intended to build on earlier U.S. and European visa bans and asset freezes imposed on Russian officials, including many in Putin's inner circle, after Moscow annexed the Crimean Peninsula from Ukraine last month.

But even with the new measures, Obama voiced pessimism about whether they would be enough to change Putin's calculus.

"We don't yet know whether it's going to work," he said.

Also on the list of those sanctioned by the U.S. Monday are Aleksei Pushkov, the Kremlin-connected head of Russian parliament's lower house, Russian Deputy Prime Minister Dmitry Kozak, and Sergei Chemezov, another longtime Putin ally. The White House said Putin has known Chemezov, CEO of the state-owned holding company Rostec, since the 1980s, when they both lived in the same apartment building in East Germany.

Most of the 17 companies on the list are controlled by three businessmen with close links to Putin: Gennady Timchenko, and brothers Boris and Arkady Rotenberg, all of whom were targeted by the first round of U.S. sanctions imposed in March.

One of the companies Timchenko owns is Stroytransgaz, a construction company that has amassed millions in contracts to build oil pipelines for state-owned Transneft. The company has recently expanded and won lucrative deals to build highways and soccer arenas for the 2018 World Cup in Russia.

None of the 17 are public companies.

The European Union did not immediately release a list of the individuals targeted by its measures, which were awaiting formal approval from the bloc's national governments. U.S. officials said they did not expect the two lists to be identical.

Neither the U.S. nor Europe plans to announce broader sanctions on Russia's key industries this week, though Obama said they were keeping those measures "in reserve" in case the situation worsens and Russia launches a full military incursion into eastern Ukraine. Among the targets of those so-called sector sanctions could be Russia's banking, defense and energy industries.

White House officials say they decided last week to impose additional penalties after determining that Russia had not lived up to its commitments under a fragile diplomatic accord aimed at easing the crisis in Ukraine. But the U.S. held off on implementing the sanctions in order to coordinate its actions with Europe.

The EU is Russia's biggest trading partner, giving it much greater economic leverage over Moscow than the U.S.. However, the EU treads more carefully in imposing sanctions since Russia is also one of its biggest oil and gas suppliers.

The failed diplomatic agreement reached in Geneva just over a week ago called on the Kremlin to use its influence to persuade pro-Russian insurgents to leave the government buildings they have occupied in eastern Ukraine. Those forces have not only balked at leaving those buildings, but have also stepped up their provocations, including by capturing European military observers and parading them before the media Sunday.

U.S. officials said there is evidence that those observers have been abused while in custody.

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The European Union added 15 more officials to its Russian sanctions list on Monday to protest Moscow's meddling in Ukraine.

The officials held responsible for "undermining Ukraine's territorial integrity, sovereignty and independence" will be banned from traveling to the 28-nation bloc and will see their assets there frozen, the EU said in a statement.

The names of the individuals targeted weren't immediately released but would be included in the official publication of the move in the bloc's legal journal early Tuesday.

The decision taken by the EU governments' ambassadors in Brussels brings the total number of Russians or pro-Russian individuals in Ukraine targeted by the EU's sanctions to 48.

Two diplomats from EU countries said the ambassadors will meet again Wednesday and could add more names. They spoke on condition of anonymity because of the sensitivity of the issue.

The initial sanctions were adopted following Russia's annexation of Ukraine's Crimean Peninsula last month. The EU and the U.S. now also accuse Russia of destabilizing eastern Ukraine. NATO says Moscow has amassed some 40,000 troops just across the Ukrainian border and could invade the country within days if it wanted to.

The EU move comes after the U.S. decided to broaden its own sanctions to include seven Russian government officials and 17 companies with links to President Vladimir Putin.

The EU is Russia's biggest trading partner, giving it greater economic leverage over Moscow than the U.S. However, the EU treads more carefully in imposing sanctions since Russia is also one of its biggest oil and gas suppliers — and the bloc apparently shied away from following Washington's lead in targeting specific Russian companies.

EU leaders have threatened Russia with tougher economic sanctions, for example targeting its financial industry or the energy sector, if the situation in eastern Ukraine further escalates, but those sanctions are not yet being considered.

No "tripwire" has so far been set to trigger those measures, British Foreign Secretary William Hague told lawmakers in London.