Turkish President Recep Tayyip Erdogan on Wednesday urged European governments to provide greater support to Syrian refugees after the launch of Western airstrikes in the country.

Turkey has voiced support for the U.S.-led strikes against Islamic State jihadists in Syria but has said that the Western forces have not used its airspace.

The United States bombed Islamic State-controlled oil refineries in Syria on Wednesday as President Barack Obama recruited more allies to fight the jihadist "network of death."

U.S., Saudi and Emirati warplanes broadened their bombardment to target the oil installations in eastern Syria that have helped fund the jihadist group's brutal rise from rebel faction to alleged global threat.

Iran's president warned the U.S. that air strikes would not destroy jihadists in Syria but appeared upbeat about securing a deal over Tehran's nuclear program, in an interview broadcast Wednesday.

The United States bombed Islamic State-controlled oil refineries in Syria as President Barack Obama rallied the world at the UN General Assembly to fight the jihadist "network of death" in Iraq and Syria.

Venezuela's leftist President Nicolas Maduro on Wednesday accused Western powers of helping create the jihadist crisis in the Middle East and said that the only solution involved respecting regional governments.

In his first speech to the U.N. General Assembly since succeeding the firebrand Hugo Chavez last year at the helm of the South American nation, Maduro said that the Ebola virus was the world's biggest threat but that Western powers were busy "bombing the people of Iraq and Syria."

Ecuador Wednesday rejected as a violation of Syrian sovereignty the air strikes the United States and Arab allies have carried out against Islamic State militants.

"The actions they carried out go against international rights, for they have not been recognized by the U.N. General Assembly nor authorized by the Security Council," the Foreign Ministry said in a statement.

By joining U.S.-led strikes in Syria, Gulf Arab monarchies are hoping to eliminate the threat to their authority from Islamic State jihadists and push the regime in Damascus out of power.

But their plan is not without serious risks, analysts warn.

Kurdish rebels on Wednesday cast doubt on continuing a truce with the Turkish authorities, accusing the ruling party of fighting a "war" with Kurds amid the advance of Islamic State (IS) militants.

The statement by the Kurdistan Communities Union (KCK) -- considered the urban wing of the mountain-based and outlawed Kurdistan Workers' Party (PKK) -- is the latest sign of the worsening climate between Turkish Kurds and the authorities.

President Barack Obama called on the world Wednesday to join the U.S.-led coalition to defeat jihadists in Iraq and Syria, branding them terrorists engaged in a "network of death."

"The United States of America will work with a broad coalition to dismantle this network of death," Obama told the U.N. General Assembly. "Today I ask the world to join in this effort."

Turkey has toughened its rhetoric against Islamic State jihadists but the West is still waiting for action from Ankara after months of frustration with its lukewarm cooperation.

Ankara on Wednesday denied Turkish air space had been used in the latest U.S.-led strikes against IS militants in Syria, but made clear that Turkey strongly supported the campaign.

The U.S. says it has hit a little-known group called "Khorasan" in Syria, but experts and activists argue it actually struck Al-Qaida's affiliate Al-Nusra Front, which fights alongside Syrian rebels.

In announcing its raids in the northern province of Aleppo on Tuesday, Washington described the group it targeted as Khorasan, a cell of Al-Qaida veterans planning attacks against the West.