A Patriot air defense system test-fired during a 2017 training in Greece.Anthony Sweeney/US ArmyThe Netherlands' PM said his country could buy Patriots from other countries to give to Ukraine.Mark Rutte said some nations have the air-defense systems but may not want to give them directly.Ukraine desperately needs more air defenses as it runs low on supplies to stop Russian attacks.One of Ukraine's main European allies said it could buy US-made Patriot air-defense systems from other countries to send on to Ukraine.Mark Rutte, the prime minister of The Netherlands, one of Ukraine's biggest backers, said at an EU leaders summit on Thursday that his country could offer Ukraine more help to combat Russia's invasion, The Guardian reported."We know that many countries are sitting on large piles of Patriot systems, maybe not wanting to deliver it directly," he said, adding: "We can buy it from them, we can deliver it to Ukraine, we have the money available.