I can’t read the minds of Arab nation’s leaders to know for certain to what extent they are concerned, but Iran (Genuinely or not) has made several statements expressing concern over Israel’s possession of nuclear weapons. The basis for any such concern would appear obvious. Israel obviously can’t do nuclear weapon’s testing without being observed by China, Russia, India, and Pakistan. So their nukes have been sitting there for at least 50 years without confirmation of their operability. Who is to say if they launch one that it doesn’t end up in Rome showering radiation across all of Greece and Turkey?
Adding to this, Israel refuses to allow inspections by the IAEA. We can assume that if they were actually leaking radiation then the facility near Dimona would appear virtually abandoned in satellite surveillance, so perhaps that is a good sign unless Israel is rotating technician assignments to minimize individual exposure at the expense of having less experienced staff…also not good.
An additional concern would be that Israel has not signed the Nuclear Non Proliferation Agreement and unlike other non signatory nations (Israel, Pakistan, South Sudan) this concern was amplified when Israel got caught attempting to sell nuclear weapons to Apartheid South Africa. In Sasha Polakow-Suransky’s The Unspoken Alliance: Israel’s Secret Relationship with Apartheid South Africa, she presents first-hand evidence of the nuclear warhead offer from Peres to South Africa’s defense minister P. W. Botha in 1975. She combed through 7,000 formerly secret documents after the government change via their equivalent of the Freedom of Information Act. Israel objected to the release of the documents but she received them anyway. Within the documents she found the minutes of a top-secret meeting between Peres and Botha on 31 March 1975. Those minutes stated: “Minister Botha expressed interest in a limited number of units of Chalet subject to the correct payload being available.” (Chalet was the code-name for Israeli Jericho missiles.) South African never ended up actually buying the missiles so explicit details on other documents discussion of warheads would be excess info. Ultimately, Israel denied it, but it gave every appearance that South Africa almost became a nuclear nation…which, if you have been keeping up with the lunacy that currently passes for government now in South Africa, they are holding ranting screaming stadium size chants about shooting and killing the white Boer farmers. Can you imagine maniacs who are so oblivious that they don’t realize they will all starve if they kill the bulk of the people having knowledge of farming…and then giving them nukes? Nope…that’s NOT what I call “good stewardship” with the technology.