Ukraine’s trust in its NATO allies has “taken a dent” because of delays and failures in the delivery of arms for the war against Russias invasion, NATO boss Jens Stoltenberg said.

The Nato chief said that it was time to revamp the coordination of international military aid to Kyiv.

“Of course, the fact that we have not delivered what we promised has put a dent … into the trust,” Stoltenberg said, pointing to the U.S. Congress taking six months to pass a $60-billion Ukraine aid package and European countries delivering much less artillery ammunition than promised.

“We need a more robust, institutionalised framework for our support to ensure predictability, to ensure more accountability and to ensure burden-sharing,” he added.

Stoltenberg said one way to avoid future shortfallswas to give NATO a greater coordinating role and draw up a multi-year plan that makes clear the contributions expected from each ally.

He has put such a proposal to NATOs 32 members and said it should be backed by a big financial commitment. Diplomats say 100 billion euros (£85 billion) over five years has been floated.

“That will make it easier to plan. It will make it clear what each and every ally is expected to deliver,” Stoltenberg said, sitting at a small table in his train carriage, jabbing a pen on a NATO notepad from time to time to emphasise his points.

“And NATO can then play a bigger role in ensuring allies actually deliver what they have announced.”