To my knowledge N. Korea is the last nuclear nation and what a disaster and nightmare that has been. The US position is independent of Israel although it serves Israel's purpose. Israel can decide for itself if and when to act against Iran. The US still has gonads even though its appetite for attacking Iran with boots on the ground is virtually zero. However, the US is perfectly capable of stopping the Iranian nuclear program without boots on the ground even if it has to nuclear bombs to Iran to do it. It really does not. It can do it with conventional deep penetrating bombs. It probably will happen in the next year. Obama has demonstrated already that he has gonads and he is hardly sterile. american lives will not be sacrificed in ending Iran's program.
U.S. warns governments, bankers Iran sanctions still in place (Reuters)
from the article: Hagel arrives in Israel for first stop on Mideast tour