Sweden has cleared its final obstacle to joining NATO after Hungary’s parliament ratified the bid in what Sweden’s prime minister called a “historic day”, while other alliance members expressed relief at the move spurred by Russia’s invasion of Ukraine.

NATO chief Jens Stoltenberg said yesterday that Sweden would make the alliance “stronger and safer” while the United States, the main alliance power, as well as Britain and Germany welcomed Sweden’s now imminent accession.

German Chancellor Olaf Scholz said that having Sweden in NATO “strengthens our defence alliance and with it the security of Europe and the world”.

Russia’s invasion two years ago prompted Sweden and neighbouring Finland to apply to join the trans-Atlantic bloc, ending their longstanding stance of non-alignment.

Every NATO member has to approve a new country however, and Hungary’s vote ended more than a year of delays that frustrated the other 31 nations as Ukraine battled Russian troops.