Stoltenberg this week proposed creating a 100 billion euro ($107 billion) five-year fund to support Ukraine, an idea that has drawn mixed responses around NATO.
Ukraine's Foreign Minister Dmytro Kuleba said that the 32-member alliance had experienced difficulties in raising military assistance of much smaller volumes.
"In other words, in the current funding model, this initiative has zero chances. Because they can't collect 500 million, and here they would have to collect 20 billion in the current model," Kuleba was quoted as saying.
But if all the bloc's members were obliged to contribute, he added, the plan could "exist and has a chance of being implemented".
