"Support must start to flow in again, but delays and also the fact that not everything is delivered as promised, has caused serious consequences. That’s also the reason why I have suggested that at the summit we agree a bigger NATO role in coordinating and providing security assistance and training for Ukraine," he said, TASS reported.

"Because I strongly believe that we need a firmer, stronger institutionalized structure for the support. Ad hoc, short-term, voluntary announcements are good, but in the long term we need more predictable, stronger support for Ukraine," he emphasized.

According to Stoltenberg, the budget has not been agreed yet. The secretary general said earlier that it was necessary to create a permanent NATO military fund for Ukraine worth $100 bln a year.