European nations with Patriot missiles hesitate to give the air defense systems to Ukraine

BRUSSELS — European Union countries possessing Patriot air defense systems gave no clear signal on Monday whether they might be willing to supply them to Ukraine, which is desperately seeking at least seven of the missile batteries to help fend off Russian air attacks.

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