NATO Secretary General Jens Stoltenberg said Friday he expects leaders at the US-led alliance's summit next week to "reaffirm that Ukraine will become a member of NATO."

Stoltenberg said he expects allied leaders will agree on a "package with three elements to bring Ukraine closer to NATO."

The first of those would be a "multi-year program of assistance to ensure full interoperability between the Ukrainian armed forces and NATO," he said at a news conference in Brussels.

Secondly, Stoltenberg said, "we will upgrade our political ties by establishing the NATO Ukraine Council."

Thirdly, "I expect our leaders will reaffirm that Ukraine will become a member of NATO and unite on how to bring Ukraine closer to its goal," the alliance head continued.

The summit will be held in Vilnius, Lithuania.