"What does Israel gain by signing?" - Binyamin Dissen Credibility. And business. Israel has been an IAEA member for 53 years. Israel could sign the NPT as a nuclear weapons state just as China did. The original reason for the US requesting Israel to remain ambiguous has long been void. The advantage of being able to SELL Israeli dual-use technology to other NPT signatories is obvious.
Turkish military denies hitting civilians in airstrikes targeting PKK militants (Reuters)
from the article: Obama: Israel should sign nuclear non-proliferation treaty