Vice President Kamala Harris warned Russia on Saturday that it will face “unprecedented” financial penalties if it invades Ukraine and predicted that such an attack would draw European allies closer to the United States.

Harris spoke at the annual Munich Security Conference the day after President Joe Biden said he was “convinced” that Russia’s Vladimir Putin has made the decision to invade neighbouring Ukraine.

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“Let me be clear, I can say with absolute certainty: If Russia further invades Ukraine, the United States, together with our allies and partners, will impose significant, and unprecedented economic costs,” Harris said.

Harris aimed to make the case to a largely European audience that the West has “strength through unity” and that an invasion would likely lead to an even bigger NATO presence on Russia’s doorstep.

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Russia annexed Ukraine’s Crimea Peninsula in 2014, and pro-Russia separatists have been fighting Ukrainian forces in the country’s east for almost eight years. The United States and the European Union previously sanctioned Russia over its seizure of Crimea.

Western fears of an invasion have escalated in recent months as Russia amassed more than 150,000 troops near Ukraine’s borders.

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Harris said the Biden administration, along with its allies, had tried to engage with Moscow in good faith to find a diplomatic resolution but that effort was not met by the Kremlin in good faith.

“Russia continues to say it is ready to talk while at the same time it narrows the avenues for diplomacy,” Harris said. “Their actions simply do not match their words.”

Harris credited European allies for speaking with a largely unified voice as the latest Ukraine crisis has unfolded. The vice president said Republicans and Democrats in Washington — who rarely agree on many major issues — are generally in agreement on the necessity of confronting Putin.

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“We didn’t all start out in the same place,” Harris said. “We came together and are now speaking with a unified voice. And that voice was a function of not only dialogue and debate, some concessions, but also the practical realisation of the moment that we are in, which is that we are looking at a sovereign nation that may very well be on the verge of being invaded yet again.”

Harris on Friday met in Munich with the leaders of Estonia, Latvia and Lithuania, who stressed that a U.S. increase in its troop presence on the eastern edge of NATO is necessary.

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The White House has not yet said whether it will fulfil those requests, but Harris suggested in her address on Saturday that an invasion could lead to a bolstered American presence.