The Arab world's reaction to Tuesday's signing of the nuclear agreement between Iran and world powers was mostly positive, namely Syria's assertion that the accord constitutes "a great victory." Turkey and Egypt were similarly enthusiastic.

The Palestinians also welcomed the deal, but a senior official told Haaretz that Ramallah also expects the international community to show similar resolve vis-à-vis the Israeli-Palestinian conflict.

"Just like the powers – especially the U.S. – were determined to conclude the negotiations [with Iran] and went to great lengths," the official said, "so do we see the Palestinian issue as an equally important matter and expect the U.S. and world powers to exert the same efforts."

Assad congratulates Khamenei

Syrian President Bashar Assad expressed confidence that his top regional ally Iran would now step up its efforts to back "just causes," suggesting he expects more backing from Tehran in his fight against insurgents.

Shi'ite power Iran has provided crucial financial and diplomatic support for Assad and has sent military advisers to Syria while backing fighters from Lebanese Shi'ite group Hezbollah and other militias involved in the conflict.

"We are confident that the Islamic Republic of Iran will support, with greater drive, just causes of nations and work for peace and stability in the region and the world," Assad said in a congratulatory message to Iran's Supreme Leader Ayatollah Ali Khamenei published by state news agency SANA.

Assad also called the atomic agreement sealed in Vienna a victory and a "major turning point" in the history of Iran, the region and the world." The coming days will see momentum in the constructive role played by the Islamic Republic of Iran in supporting for the rights of people and the laying of the foundation stones for amiable relations between nations for the good of humanity," Assad said in a separate message to Iran's President Hassan Rouhani, according to SANA.

The Syrian Foreign Ministry welcomed the agreement, saying its importance lies in the fact that diplomacy has triumphed over threats and sanctions. In a statement, the ministry added that the deal will contribute to regional security and stability.

The Egyptian Foreign Ministry expressed hope that the agreement with Iran will put a stop to the nuclear arms race in the Middle East.

Turkey: Deal vital to Mideast peace, stability

Turkey welcomed the nuclear deal between Iran and six world powers on Tuesday, saying it was of vital importance for the stability of the Middle East, but urged Tehran to rethink its policies on issues from Syria to Yemen.

Foreign Minister Mevlut Cavusoglu said transparent implementation of the deal would now be key and that the easing of sanctions would be of economic benefit to Turkey, which is one of Iran's major trading partners.

But he also called on Tehran to play a constructive role in conflicts around the region.

"We have to abandon sectarian-based policies and place particular emphasis on political dialogue. We need to contribute to resolution of these issues through dialogue. This is what we expect from brotherly Iran," Cavusoglu told a news conference.

Turkey and Iran have in the past accused each other of trying to dominate the Middle East, backing opposing sides in the war in Syria and the crisis in Yemen, but their economic interdependence has kept relations broadly on track.

Turkey's imports from Iran were nearly $10 billion in 2014 and its exports totalled around $4 billion.

Finance Minister Mehmet Simsek said the deal was "great news" for the Turkish economy as it would likely boost bilateral trade, while Energy Minister Taner Yildiz said it could unlock investment in the Islamic Republic.

The Turkish Exporters' Assembly said bilateral trade would probably double to $35 billion by the end of next year in the wake of the agreement.

Meanwhile, a Saudi official said that while the nuclear deal will mean "a happy day" if it stops Iran gaining a nuclear arsenal, the agreement would prove bad if it allowed Tehran to "wreak havoc in the region."

The official told Reuters Iran had destabilized the whole Middle East through its activities in Iraq, Syria, Lebanon and Yemen and added that if the deal allowed it concessions, the region would become more dangerous.