WASHINGTON — President Biden on Tuesday announced harsh new sanctions aimed at punishing Russia for what he called “the beginning of a Russian invasion of Ukraine,” joining European leaders in imposing severe economic consequences for blatant violations of national sovereignty.

Speaking from the East Room of the White House, Mr. Biden condemned President Vladimir V. Putin of Russia for his aggression against Ukraine, saying that the Russian action is “a flagrant violation of international law and demands a firm response from the international community.”

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