Israel’s official stance is "we won't be the first to introduce nuclear weapons," but after the Vanunu leak and various intelligence reports, pretty much everyone (including groups like SIPRI) agrees they have around 90 nukes.
What puzzles me is the international response. When Iran is suspected of enriching uranium, they face crippling global sanctions. North Korea is completely isolated for its tests. Even India and Pakistan faced immediate US sanctions back in 1998 after their nuclear tests.
However, Israel is not a signatory to the Non-Proliferation Treaty (NPT). Does the international community treat them differently because they never signed the treaty and are therefore not technically "breaking" a contract? Or is it purely due to geopolitical favoritism from the US and other allies?
Basically, why is there no massive international pressure on them compared to everyone else?