BRUSSELS (AP) — NATO Secretary-General Jens Stoltenberg on Friday pressed member countries to give more Patriot missile systems to Ukraine as President Volodymyr Zelenskyy repeated Kyiv’s almost daily appeals for more Western air defense equipment.

“NATO has mapped out existing capabilities across the alliance and there are systems that can be made available to Ukraine,” Stoltenberg told reporters after an online meeting of defense ministers from the 32-nation alliance, which Zelenskyy took part in remotely.

Russia’s air force is vastly more powerful than Ukraine’s, but sophisticated missile systems provided by Kyiv’s Western partners are a major threat to Russian aviation as the Kremlin’s forces slowly push forward along the around 1,000-kilometer (620-mile) front line in the war.

Kyiv is seeking at least seven Patriot batteries. Stoltenberg declined to say which NATO nations have air defense systems or how many might be available, saying that this is classified information, but he insisted that he expects the countries to make new announcements of support soon, not only Patriots.