WASHINGTON —

       President Biden arrived at NATO headquarters in Brussels Thursday for a day of wartime summitry, seeking to keep the 30-nation alliance united in its effort to isolate and punish Russia for its invasion of Ukraine.

       The extraordinary gathering of leaders, planned in just days, was convened largely to send a signal of resolve to Russian President Vladimir Putin while ensuring NATO allies remain on the same page as they plot additional measures against Moscow and prepare for scenarios that could draw them deeper into the conflict.

       “We are determined to continue to impose consequences on Russia to bring about an end to this brutal war,” NATO General Secretary Jens Stoltenberg said as he opened the meeting, expressing support for Ukraine, recognizing “the great courage” of its people and for those inside Russia “who are bravely speaking out against the war.”

       “We hear the voices,” he said. “They matter.”

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       Stoltenberg announced Wednesday that NATO was likely to formalize a decision to double the number of battlegroups on its eastern flank, which would mean deploying more forces to Bulgaria, Hungary, Romania and Slovakia. The alliance has already doubled its initial troop presence along the eastern flank since Russia launched its invasion of Ukraine on Feb, 24.

       There are currently 100,000 U.S. troops stationed in Europe. Jake Sullivan, Biden’s national security advisor, said Wednesday the administration does not currently have plans to send more forces to Europe.

       NATO Leaders began a closed session Thursday after posing for a “family photo,” and they are expected to announce additional sanctions on Russia. The U.S. also plans to impose new sanctions on more than 300 members of Russia’s Duma, the White House has said.

       Volodymyr Zelensky, Ukraine’s president, was expected to address the NATO leaders via videoconference and to reiterate requests for additional aid he’s sounded in speeches to lawmakers in Washington, Berlin, Ottawa and other Western capitals.

       Biden arrived in Brussels Wednesday evening and will also participate in meetings Thursday afternoon with the Group of Seven leaders and the European Commission. He will hold a press conference before traveling to Poland on Friday.

       The discussions among leaders, Sullivan said, would include planning for numerous “potential contingencies,” including what to do in the event that Russia launches cyberattacks against the U.S. or other NATO countries or uses chemical or biological weapons in Ukraine.

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       The president’s overseas trip is mostly about symbolism and keeping NATO together.

       Under NATO’s Article V, an attack against one member nation is considered an attack against all. Since Russia began its war in Ukraine, NATO members have imposed severe economic sanctions, taken steps to ban or limit imports of Russian energy and contributed billions in defense aid to Ukraine. They are attempting to punish Moscow as severely as possible while steering clear of any direct military engagement that Putin could use to justify expanding the conflict into NATO territory.

       Putin, allies fear, may seek to escalate the conflict out of frustration in his brazen campaign’s lack of progress. Russian officials seemed to have believed the invasion would take just days but instead has bogged down as the war entered its second month. Perhaps as many as 10,000 Russian troops have been killed by Ukraine’s military and resistance fighters, which halted the eastern advance on Kyiv Wednesday and pushed back Russian troops several miles.

       With Russia struggling to conquer Ukrainian territory, Putin has increasingly unleashed artillery, bombs and missiles against civilian targets, prompting Secretary of State Antony Blinken Wednesday to formally declare that the U.S. has concluded Russia’s actions against Ukraine constitute war crimes.

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       Attacks on civilian targets, including apartment buildings, schools, a maternity ward and a theater said to be sheltering children, are cited.

       The crisis in Ukraine has taken Biden’s own chosen frame for his presidency — a historic confrontation pitting democracies versus autocracies — beyond the theoretical. It has also served as the impetus for reinvigorating a transatlantic alliance that, some seven decades after World War II, had seemed to be losing its focus and shared purpose.

       But Stephen Sestanovich, an expert on Russia at the Council on Foreign Relations, said Biden will have to ensure NATO members enact more sanctions and take other concrete steps to punish Russia if he wants the meeting to be considered an operational success.

       It remains unclear, however, how much further some European countries are willing to go. While Germany, for example, has committed to increasing defense spending and halted the certification of the Nord Stream 2 gas pipeline from Russia to its Baltic coast, it continues to rely on Russian energy, as do many other European countries.

       “This war is accelerating Europe’s awakening to the real threat posed by Russia,” said Alexandra de Hoop Scheffer, transatlantic security research director for the German Marshall Fund.

       “But It seems that the European Union has pretty much reached the limit of what it actually can do because if we really wanted to act seriously and cause pain to Russia, it would involve limiting our imports of gas and oil,” Scheffer said, adding that some countries have declared they cannot take such action.

       Calling the coming days “a tipping point phase of conflict” because Russia may be encountering difficulties on the ground while Ukraine is fighting hard but desperate for more aid, Scheffer said NATO countries needed to “accelerate our support before it’s too late. It’s not a question of months or weeks, it’s a question of days.”