"The doors remains open. We have decided so. I was at the summit in Bucharest when we decided that Ukraine will be a member (of the NATO -ed.). This decision remains in force if Ukraine fulfills the criteria for the membership and if it wants to (join - ed.)," Stoltenberg said.
However, the NATO secretary general reminded that Ukraine had decided to choose a non-aligned policy.
"The question of Ukrainian membership was not on the agenda in recent years because Ukraine had decided this way. I respect that decision because every sovereign nation chooses its own security policy. But our doors are open to countries that have met the criteria for membership, and this refers to Ukraine," Stoltenberg said.
On Sunday, German Foreign Minister Frank-Walter Steinmeier said he does not see Ukraine as a member of the Alliance.
A clause stating that the one of Ukraine's goals is membership in NATO was introduced into the text of the Ukrainian parliament coalition agreement.
Russian president's press secretary Dmitry Peskov in an interview with BBC stated that Russia needs assurances that Ukraine will not become a member of NATO.