It was a temporary armistice line and not a border at Arab insistance by the way that only lasted for 18 years. The UN Security Council does not have the authority to elevate the status of armistice lines to that of being international borders without the agreement of both parties on either side of it to that effect. So, it's back to the negotiating table again. Oh dear, and what's Abbas going to do about Hamastan (the Gaza Strip)? Maybe he can get the UNSC to force Hamas to cede control of Gaza back to the PLO.
from the article: PA official: Arab states to attempt UN-forced settlement freeze