KYIV, Feb 20 - President Joe Biden swept unannounced into Ukraine on Monday to meet with President Volodymyr Zelensky in a defiant display of Western solidarity with a country still fighting what he called “a brutal and unjust war” days before the first anniversary of Russia’s invasion.

“One year later, Kyiv stands,” Biden declared after meeting Zelensky at Mariinsky Palace. Jabbing his finger for emphasis on his podium, against a backdrop of three flags from each country, he continued: “And Ukraine stands. Democracy stands. The Americans stand with you, and the world stands with you,” The Associated Press reported.

Biden spent more than five hours in the Ukrainian capital, consulting with Zelensky on next steps, honoring the country’s fallen soldiers and seeing U.S. embassy staff in the besieged country. Altogether he was on Ukrainian territory for about 23 hours, traveling by train from and back to Poland.

The visit came at a crucial moment: Biden is trying to keep allies unified in their support for Ukraine as the war is expected to intensify with spring offensives. Zelensky is pressing allies to speed up delivery of promised weapon systems and calling on the West to provide fighter jets — something that Biden has declined to do.

The U.S. president got a taste of the terror that Ukrainians have lived with for close to a year when air raids sirens howled just as he and Zelensky wrapped up a visit to the gold-domed St. Michael’s Cathedral.

Looking solemn, they continued unperturbed as they laid two wreaths and held a moment of silence at the Wall of Remembrance honoring Ukrainian soldiers killed since 2014, the year Russia annexed Ukraine’s Crimean peninsula and Russian-backed fighting erupted in eastern Ukraine.

In Kyiv, Biden announced an additional half-billion dollars in U.S. assistance — on top of the more than $50 billion already provided — for shells for howitzers, anti-tank missiles, air surveillance radars and other aid but no new advanced weaponry.

Ukraine has also been pushing for battlefield systems that would allow its forces to strike Russian targets that have been moved back from frontline areas, out of the range of HIMARS missiles that have already been delivered. Zelensky said he and Biden spoke about “long-range weapons and the weapons that may still be supplied to Ukraine even though it wasn’t supplied before.” But he did not detail any new commitments.

“Our negotiations were very fruitful,” Zelensky added. Sullivan would not detail any potential new capabilities for Ukraine, but said there was a ”good discussion” of the subject.

Biden’s mission with his visit to Kyiv, which comes before a scheduled trip to Warsaw, Poland, is to underscore that the United States is prepared to stick with Ukraine “as long as it takes” to repel Russian forces even as public opinion polling suggests that U.S. and allied support for providing weaponry and direct economic assistance has started to soften. For Zelenskyy, the symbolism of having the U.S. president stand side by side with him on Ukrainian land as the anniversary nears is no small thing as he prods allies to provide more advanced weaponry and step up delivery.

“I thought it was critical that there not be any doubt, none whatsoever, about U.S. support for Ukraine in the war,” Biden said.

Biden’s trip was a brazen rebuke to Russian President Vladimir Putin, who had hoped his military would swiftly overrun Kyiv within days. Biden recalled speaking with Zelensky on the night of the invasion, saying, “That dark night one year ago, the world was literally at the time bracing for the fall of Kyiv. Perhaps even the end of Ukraine.”

A year later, the Ukrainian capital remains firmly in Ukrainian control. Although a semblance of normalcy has returned to the city, regular air raid sirens and frequent missile and killer-drone attacks against military and civilian infrastructure across the country are a near-constant reminder that the war is still raging. The bloodiest fighting is, for the moment, concentrated in the country’s east, particularly around the city of Bakhmut, where Russian offensives are underway. (ap/ez)