worthjust reminding you about the origins of the alliance and its central article of collective defence. the north atlantic treaty organisation was established in 1949 in a bid to stop soviet expansion following the second world war. it was initally made up of 12 countries including the us uk canada and france. since then, the membership has grown to 31 with finland the very latest to join. the central principle of nato, is its commitment to collective defence. under article 5 of the treaty, all member countries agree to help each other, if one of them is attacked. and it s that commitment which makes many countries wary about allowing ukraine to join. let s cross live to my colleague lewis vaughanjones in vilnius. over lewis vaughanjones in vilnius. to you. over lewis vau:han jones in vilnius. to ou. ., , plenty of warm words and support for ukraine in the last couple of hours, or updates like denmark, training f-165, or updates like denmark, training f 16s, fighterjets, ukr