BRUSSELS >> Ukraine on Tuesday renewed its appeal to Western countries for fighter jets to help frustrate Moscow’s almost year-long invasion, but won no assurances at a high-level defense meeting in Brussels that it would receive any combat aircraft.

“I don’t have any announcements on aircraft to make today,” U.S. Defense Secretary Lloyd Austin told reporters after chairing a meeting of the Ukraine Defense Contact group at NATO headquarters, where 54 countries were represented.

Even so, Ukraine’s allies pledged more weapons, ammunition and tanks as senior defense officials at the meeting said the war with Russia is approaching a critical stage.

“This isn’t about one single capability,” Austin told a press conference, referring to the warplanes. “It’s about delivering all the capabilities that we promised. It’s about integrating these systems together.”

The first challenge, he said, is to make sure all the military aid is used effectively.

“It’s a monumental task to bring all those systems together and get the troops trained on those platforms,” he said.

As Moscow musters its forces for a potential push in eastern Ukraine, Austin said Kyiv could launch its own offensive in the spring.

With the war set to enter its second year at the end of next week, Ukraine Defense Minister Oleksiy Reznikov was in Brussels to press his country’s case for fighter jets, holding up an image of a warplane when asked what military aid his country is seeking.

Ukraine President Volodymyr Zelenskyy pushed hard for combat planes last week when he visited London, Paris and Brussels on just his second foreign trip since Russia invaded on Feb. 24, 2022. His plea came days after Western allies pledged to provide Kyiv with tanks.

Moscow’s forces have been pressing in the east of Ukraine while bolstering their defensive lines in the south. The war has been largely static during the winter months, though both sides are expected to launch offensives when the weather improves.

Ukraine’s dogged resistance and Western weapons and intelligence have helped thwart the Kremlin’s ambitions of securing the entire eastern Donbas region. But the risk remains that in some areas Kyiv’s forces could be overwhelmed by the sheer weight of Russian troop numbers.

Gen. Mark Milley, the chairman of the Joint Chiefs of Staff, said Russian forces are “struggling mightily” and making only slow progress in the Donbas. “However, they do have numbers” to keep fighting, Milley said.

Putin was hoping Western support for Kyiv would fizzle out, Austin, the U.S. defense secretary, said.

“Today’s meeting comes at a critical time,” Austin said. “The Kremlin is still betting that it can wait us out.”

NATO Secretary-General Jens Stoltenberg, asked when he expects Russia’s so-called spring offensive to begin, said that “the reality is that we have seen the start already.”

“For me, this just highlights the importance of timing. It’s urgent to provide Ukraine with more weapons,” he told reporters in Brussels.

Another issue occupying the minds of NATO allies is how to keep up a steady supply of ammunition to Ukraine without depleting their own stockpiles.

According to some estimates, Ukraine is firing up to 6,000-7,000 artillery shells each day, around a third of the daily amount that Russia is using.

Stoltenberg warned Monday that Ukraine is using up ammunition much faster than its allies can supply it.

However, the Russians appear short on resources for any major offensive at the moment, the U.K. Ministry of Defense said.

“Overall, the current operational picture suggests that Russian forces are being given orders to advance in most sectors, but that they have not massed sufficient offensive combat power on any one axis to achieve a decisive effect,” it tweeted.

In Ukraine, the country’s presidential office said Tuesday that Russian shelling killed at least three civilians and wounded another eight over the previous 24 hours as fighting continued in the south and east.

Russian forces shelled 17 towns and villages in the Donetsk region. Gov. Pavlo Kyrylenko said. “The Russians are destroying everything in their path,” he said.

Ukraine officials also reported intense shelling and air strikes in Luhansk province, while in the south Russian forces shelled the city of Kherson 13 times over 24 hours, destroying a railway and residential buildings.

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Tara Copp in Brussels contributed to this story.