Ukrainian President Volodymyr Zelenskyy called on people worldwide to gather in public Thursday to show support for his embattled country as U.S. President Joe Biden and other world leaders met for talks focused on pressuring Russia to end the invasion that is entering its second month. “Come to your squares, your streets. Make yourselves visible and heard,” Zelenskyy said in English during an emotional video address late Wednesday that was recorded in the dark near the presidential offices in Kyiv. “Say that people matter. Freedom matters. Peace matters. Ukraine matters.” International efforts to make Russia pay for its aggression and to contain Europe’s biggest security crisis since World War II shifted their focus to Brussels. The Belgian capital became a flurry of diplomatic activity as Biden and other leaders huddled for a day-long series of talks on the war’s repercussions, including the possibility of more sanctions on Russia, how to deal with soaring energy costs and the growing needs of Ukrainian refugees and the stiffening of defenses in eastern European nations alarmed about Russian aggression. Opening an emergency summit, NATO Secretary-General Jens Stoltenberg said the alliance is “determined to continue to impose costs on Russia to bring about the end of this brutal war.” Russia unleashed its invasion Feb. 24 but instead of swiftly toppling Ukraine’s government, its forces are bogged down in a grinding military campaign and its economy is laboring under punishing international sanctions. “This is a month now,” Zelenskyy said Thursday in an address to Sweden’s parliament, the latest of many to whom the Ukrainian leader has pleaded for help. “We have not seen a destruction of this scale since World War II.” After a month of fighting, Western analysts say Ukrainian forces need stocking up again with the weapons that have helped them slow and repel Russian advances. Both sides claimed Thursday to have inflicted more blows. Ukraine’s navy said it sank a ship that had been used to resupply the Russian campaign with armored vehicles. Russia claimed to have taken a town, Izyum, in eastern Ukraine after heavy fighting. But in many areas, Ukrainian forces appear to have battled Russian troops to a stalemate, an outcome that seemed unlikely when Russian President Vladimir Putin unleashed his invasion force. Determined to make Putin change course, and under intense pressure from Zelenskyy to do more, Western nations said more help is on the way for Ukraine. European Union nations signed off on another 500 million euros ($550 million) in military aid. And Biden was expected to discuss new sanctions on Russia, along with more military aid for Ukraine, with NATO members. He will also talk with leaders of the G7 industrialized nations and the European Council in a series of meetings on Thursday. Sending a signal that sanctions have not brought it to its knees, Russia reopened its stock market Thursday, but allowed only limited trading. The curbs on a reduced number of stocks including energy giants Gazprom and Rosneft were meant to prevent a repeat of a massive selloff that took place Feb. 24. Foreigners were barred from selling and traders were barred from short selling, or betting prices would fall. The benchmark MOEX index gained 8% in the first minutes of trading.