BRUSSELS (AP) — 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.

Only Germany has come forward with a single Patriot missile battery in answer to Ukraine’s latest request.

At a meeting of EU foreign and defense ministers, Dutch Foreign Minister Hanke Bruins Slot said the Netherlands is “looking at every kind of possibility at the moment” and is offering financial support to a German initiative to help Ukraine bolster its air defenses and to buy more drones.