You should also try to read the treaty [un.org]. It's not a defence pact.
Sorry, it's not a treaty either. It's an agreement that doesn't obligate the parties to much of anything at all.
It's actually correct to call it a treaty. The link points to a memo, which supplement Ukraine's accession to the nuclear non-proliferation treaty. To read the treaty would also cover reading the memos supplementing it. To link to a memo whose sole purpose is to supplement a treaty and use that particular word as the link's text content seems only logical to me.
But yes, it's just a collection of nice words that whole memo/treaty/agreement.