JERUSALEM, Israel -- Israeli Prime Minister Benjamin Netanyahu said the Islamic wave sweeping the Arab world puts huge pressure on Israel's security and defenses.

"What we have seen is such a huge transformation in our region that we know we will have to spend a lot more to defend ourselves," Netanyahu said during an address to American Jewish leaders Sunday evening.

The address followed a two-hour meeting with U.S. National Security Advisor Tom Donilon. Donilon arrived on his first official visit to Israel on Saturday for talks on Iran, Syria, and regional security issues, the White House said in a statement.

Netanyahu avoided talking about a threat of a nuclear Iran in his 30-minute speech. Instead, he said "there's so much talk about it that I'm not going to bore you with details."

The U.S. and Israel are certainly not bored with Iran.

Donilon's visit is the latest in a series of high-level meetings in Jerusalem and Washington and comes ahead of a Netanyahu visit to the United States.

The Israeli daily Ha'aretz said it reflects growing concern in Washington that Israel might decide to attack Iranian nuclear sites.

"It's not prudent at this point to decide to attack Iran," U.S. Joint Chiefs of Staff chairman Gen. Martin Dempsy said during a weekend interview.

"A strike at this time would be destabilizing and wouldn't achieve their [Israel's] long-term objectives," he said.

Dempsey, who was in Israel last month, also said economic sanctions on Iran were beginning to take effect. Last week, Netanyahu said the sanctions were not working.

Meanwhile, Iran said it would agree to another round of talks on its nuclear program.