Both sides can use each other’s expertise, Ukrainian president stresses; more Russian oil facilities burning after attacks. What we know on day 1,559 Both sides can use each other’s expertise, Ukrainian president stresses; more Russian oil facilities burning after attacks. What we know on day 1,559 Volodymyr Zelenskyy has urged the US to conclude a drone deal with Ukraine . “The US wanted to test all types of our drones. We agreed to the way they wanted to test, train with, and use our systems