As the Gulf War approached in early 1991, Iraq cancelled all international agreements with Saudi Arabia since 1968. Saudi Arabia responded by registering all previous boundary agreements negotiated with Iraq at the United Nations in June 1991. Thus ended the legal existence of the Saudi–Iraqi neutral zone.
The article mentioned the neutral zone no longer existed but did not say how the status was resolved. Who owns the neutral zone at the end? Is it Saudi Arabia, as victor of the Gulf War? Did Iraq subsequently dispute this (it seems that whatever step Saudi in 1991 did was unilateral)?
Bonus: If you could also edit the Wikipedia article to clarify this ;)