The Economist asks
Before 1 April 2019, how many countries will formally progress in the NATO accession process?
Formal progression in the NATO accession process consists of a country: reaching a new stage of any of the seven stages listed under the accession process section (NATO); receiving an invitation to participate in a Membership Action Plan (NATO); or entering into Intensified Dialogue (Project Gutenberg). Countries will only be counted once.
Macedonia was the only country to formally progress in the NATO accession process. This question closed as "1" with an end date of 1 April 2019.