US President Joe Biden on Thursday hit back against Russia’s invasion of Ukraine, unleashing robust new sanctions, ordering the deployment of thousands of additional troops to NATO ally Germany and declaring that America would stand up to Russia’s Vladimir Putin.

He also acknowledged that the invasion — and efforts to thwart Putin — will have a cost for Americans. But he sought to reassure the public that the economic pain that may come with rising energy prices will be short-lived in the US.

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As for the Russian president, Biden said, “He’s going to test the resolve of the West to see if we stay together. And we will.”

Targeting Russia’s financial system, Biden said, the United States will block assets of large Russian banks, impose export controls aimed at the nation’s high-tech needs and sanction its business oligarchs.

The president said the US also will be deploying additional forces to Germany to bolster NATO after the invasion of Ukraine, which is not a member of the defence organisation. Some 7,000 additional US troops will be sent.

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Some US lawmakers — and Ukrainian officials — called on Biden to do more.

“There is more that we can and should do,” said Sen Bob Menendez, D-N.J., the chairman of the Foreign Relations Committee, pointing to the possibility of removing Russian banks from the SWIFT international banking system and sanctioning Putin personally. “Congress and the Biden administration must not shy away from any options.”

Senate Republican leader Mitch McConnell expressed support Thursday for Biden’s latest moves but also urged Biden to apply maximum pressure on Putin. McConnell said the top four congressional leaders in the House and Senate received a classified briefing from the president late Thursday.

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“We’re all together at this point and we need to be together about what should be done,” McConnell said. “But I have some advice: Ratchet the sanctions all the way up. Don’t hold back.”

White House deputy national security adviser Daleep Singh stressed that the Biden administration valued closed coordination with allies and avoiding even the perception of hurting ordinary Russian citizens as they roll out sanctions. He declined to detail a circumstance in which Biden might approve cutting the Russians off from SWIFT or target Putin directly.

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“When we consider which sanctions to apply, we’re not cowboys and cowgirls pressing a button to impose costs,” Singh said. “We follow a set of principles. We want the sanctions to be impactful enough to demonstrate our resolve, and to show that we have the capacity to deliver overwhelming costs to Russia.”

Biden declared that Putin, who has referred to the collapse of the Soviet Union as the “greatest geopolitical catastrophe” of the past century, is looking beyond Ukraine.

“He has much larger ambitions,” Biden said. “He wants to, in fact, reestablish the former Soviet Union. That’s what this is about.”

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The penalties announced Thursday fall in line with the White House’s insistence that it would hit Russia’s financial system and Putin’s inner circle, while also imposing export controls that would aim to starve Russia’s industries and military of U.S. semiconductors and other high-tech products.

“Putin is the aggressor,” Biden said. “Putin chose this war, and now he and his country will bear the consequences.”

But Biden, for now, held off imposing some of the most severe potential sanctions, including cutting Russia out of the SWIFT payment system, which allows for the transfers of money from bank to bank around the globe.

Biden announced the sanctions at the White House while Ukraine’s government reported mounting casualties inflicted by Russian forces attacking from the east, north and south.

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Oil and natural prices have already surged over concerns that Russia — an energy production behemoth — will slow the flow of oil and natural gas to Europe. Biden, however, acknowledged the sanctions are “going to take time” to have their effect on the Russian economy.

Biden added that after Russia’s “brutal assault” against Ukraine it would be a mistake to allow Putin’s actions to go unanswered. He said if they did, “the consequences for America would be much worse.”

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“America stands up to bullies, we stand up for freedom,” Biden said. “This is who we are.”

Biden spoke hours after holding a virtual meeting with the leaders of Britain, Canada, France, Italy and Japan. European Commission President Ursula von der Leyen, European Council President Charles Michel and NATO Secretary General Jens Stoltenberg also joined the meeting.