There is no ambiguity. No one outside of Israel is fooled. The present purpose of Israeli government pretense is not international but domestic--to allow the keepers of Israel's bombs from facing any internal accountability. And the Israeli voters seem happy with this. There is no obligation on the US side to go along with this foolishness and it is contrary to America's interests. But President Obama allows himself to be manipulated by Israel and thus look ridiculous to the world by going along with the pretense.
Donald Trump: Israeli settlement construction in West Bank should 'keep going' (Haaretz)
from the article: Israel's nuclear ambiguity no longer serves a purpose