The Slovenian parliament ratified Montenegro's NATO accession protocol by a vast majority of votes on Wednesday.
The motion was carried by 73 votes in favour and three against. Montenegro's accession to NATO was backed by both the ruling coalition and the opposition, with the exception of the opposition United Left which is against all military alliances.
Slovenia is the second country to ratify Montenegro's NATO accession protocol after Iceland did so on Tuesday.
Addressing the parliament, Prime Minister Miro Cerar praised Montenegro for the "impressive" progress it had made since it became independent. He said that NATO's invitation to Montenegro to join the alliance showed that the alliance's door remained opened to new members and that it was an important factor of stability in the region.