KYIV, Ukraine (AP) — Russia’s recent escalation of missile and drone attacks is stretching Ukraine’s air defense resources, a Ukrainian air force official said Tuesday, leaving the country vulnerable in the 22-month war unless it can secure further weapons supplies.

“Intense Russian air attacks force us to use a corresponding amount of air defense means,” air force spokesman Yurii Ihnat told national television. “That’s why we need more of them, as Russia keeps increasing its (air) attack capabilities.”

As soldiers on both sides fight from largely static positions along the roughly 1,500-kilometer (930-mile) front line, recent Russian attacks have used large numbers of various types of missiles in an apparent effort to saturate air defense systems and find gaps in Ukraine’s defenses.

The massive barrages — more than 500 drones and missiles were fired between Dec. 29 and Jan. 2, according to officials in Kyiv — are also using up Ukraine’s weapons stockpiles.

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Ukraine uses weapons from the Soviet era and more modern ones provided by its Western allies. Authorities want to build up the country’s own weapons manufacturing capabilities, and analysts say those plants are among Russia’s recent targets.

“At the moment, we are completely dependent on the supply of guided air defense missiles, for both Soviet and Western systems,” Ihnat said.

President Volodymyr Zelenskyy said on Jan. 7 that “we lack a very concrete and understandable thing, that is air defense systems,” to protect civilian areas and troop positions.

“We lack (air defense systems) both on the battlefield and in our cities,” he told a Swedish defense conference.

Speaking at a meeting with the Russian military brass, Defense Minister Sergei Shoigu declared that Kyiv’s efforts to bolster its firepower “won’t change the situation on the line of contact and will only drag out the military conflict.”

“We retain the strategic initiative along the entire line of contact,” Shoigu said. “We will consistently continue to achieve the objectives of the special military operation” — the Kremlin’s language for the war in Ukraine.

It was not possible to verify either side’s battlefield claims.

In what officials called the biggest aerial barrage of the war, Russia launched 122 missiles and dozens of drones on Dec. 29, killing 62 civilians across the country. On Jan. 1, Russia launched a record 90 Shahed-type drones across Ukraine.

Russia has expanded its own production of missiles and drones, analysts say, and has begun using short-range missiles provided by North Korea.

Ukrainian officials have pleaded with the West for more weapons, especially air defense and artillery shells.

However, a plan by the administration of U.S. President Joe Biden to send to Kyiv billions of dollars in further aid is stuck in Congress, and Europe’s pledge in March to provide 1 million artillery shells within 12 months has come up short, with only about 300,000 delivered so far.

U.S.-made surface-to-air Patriot missiles give Ukraine an effective shield against Russian airstrikes, but the cost is up to $4 million per missile and the launchers cost about $10 million each, analysts say.

Such costly support is “essential” for Ukraine, a U.S. think tank said.

“The continued and increased Western provision of air defense systems and missiles to Ukraine is crucial as Russian forces continue to experiment with new ways to penetrate Ukrainian air defenses,” the Institute for the Study of War said.

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