Israeli Prime Minister Benjamin Netanyahu called the emerging Iran nuclear deal an enormous mistake that is the result of western powers caving into Iran's demands.

President Obama announced the deal early Tuesday morning, but two hours before that, Netanyahu took to Twitter to express his opposition.

"When willing to make a deal at any cost, this is the result," he tweeted. "From early reports, we can see that the deal is a historic mistake."

Netanyahu also tweeted that the U.S. and other world powers have made "far-reaching concessions" that won't keep nuclear weapons away from Iran.

"In addition, Iran will receive hundreds of billions of dollars with which it can fuel its terror machine and its expansion and aggression throughout the Middle East and across the globe," he added in a separate statement. "One cannot prevent an agreement when the negotiators are willing to make more and more concessions to those who, even during the talks, keep chanting: 'Death to America.'"

"I say to all the leaders in Israel, it is time to put petty politics aside and unite behind this most fateful issue to the future and security of the State of Israel," he concluded.

In a live broadcast in his country, Netanyahu stressed that Iran doesn't have to be bound by the deal at all.

"What a stunning, historic mistake," Netanyahu said. "Israel is not bound by this deal with Iran, and Israel is not bound by this deal with Iran because Iran continues to seek our destruction."

Late Monday, Israel feared that the deal would also call for the United Nations' conventional arms embargo to be lifted against Iran. That concession, if made, would threaten Israel's existence.

Early reports said the arms embargo would fall away after five years.

Asked Monday about that element, the White House declined to say specifically that the arms embargo would remain in place, but said the U.S. position has been that only nuclear-related sanctions should fall.