Meaningless dithering. The article does not describe a pre-emptive role, but the normal UN peacekeeping which is usually only inserted in a conflict zone with the MUTUAL consent of the principal parties to the conflict. Unless and until there is an actual armed conflict brought about by rising sea levels, AND the combatants ask for UN peacekeeping, this would never come up.
Contrary to the snark, UN peacekeepers actually do perform a useful function, but it is only within a certain particular envelope in the spectrum of conflict and politics on the ground. It fails when one or both sides reach the point where they decide they have more to gain by renewing the conflict than continuing the status quo with a buffer between them.