STORY: "Russia hopes to drag out the war and exhaust our forces. So we have to make time our weapon," Zelenskiy added.

Zelenskiy issued his latest appeal for increased weapons shipments days after Germany and the United States led a list of countries agreeing to supply modern tanks.

Zelenskiy on Saturday said Ukraine needed the U.S.-made ATACMS missile with a range of about 300 km, which Washington has so far declined to supply. A presidential adviser said talks were under way on supplying long-range missiles and a Ukrainian air force spokesman spoke of negotiations on providing aircraft.