The Netherlands announced Friday it was preparing delivery of 18 of the American-made F-16 combat jets pledged to Ukraine, at a moment when Kyiv is under pressure on all fronts. With US approval, Denmark and the Netherlands announced in August they would provide up to 61 jets, once Ukrainian pilots had been trained up. Approval is required for re-exports of military equipment, and the government said Friday the planes will require further testing before they can be delivered.