Iran's supreme leader Ayatollah Ali Khamenei on Saturday warned those involved in popular Arab uprisings against trusting Western powers and their "promises," saying they should instead confide in Islam for solutions.

"Never trust America, NATO, and criminal regimes like Britain, France and Italy -- who for a long time divided your lands (among themselves) and plundered them," Khamenei said as he opened a two-day conference in Tehran on "Islamic Awakening" attended by several hundred guests from Arab countries.

Fighters loyal to Libya's new leaders on Friday thrust deep into the city of Sirte and into desert oasis Bani Walid, two of fugitive Moammar Gadhafi’s few remaining bastions, Agence France Presse reporters said.

On the political front, officials in Tripoli said a new transitional government would be announced on Sunday, while the U.N. General Assembly gave Libya's U.N. seat to the former rebel National Transitional Council.

Turkish Prime Minister Recep Tayyip Erdogan lashed out at Syrian President Bashar al-Assad on Friday, telling him the era of oppressive dictators is past.

Erdogan, who is in Tripoli on the final leg of his "Arab Spring" tour, hailed the advent of democracy in Libya and the "memory of martyrs who sacrificed themselves for their country and their religion."

Fighters loyal to Libya's new leaders surged Friday into the city of Sirte and into Bani Walid oasis, two of fugitive Moammar Gadhafi’s few remaining bastions, officials and an Agence France Presse reporter said.

On the political front, Turkish Prime Minister Recep Tayyip Erdogan arrived in Tripoli, boosting international support for the National Transitional Council (NTC) a day after Britain's David Cameron and France's Nicolas Sarkozy became the first foreign leaders to visit the new Libya.

Turkish Prime Minister Recep Tayyip Erdogan arrived in the Libyan capital on Friday on the final leg of his "Arab Spring" tour, an Agence France Presse photographer said.

Erdogan arrived from Tunisia at Tripoli's airport, where he was greeted by Mustafa Abdel Jalil, number two in the new ruling National Transitional Council (NTC), whose forces last month toppled despot Moammar Gadhafi.

Forces of Libya's new leadership were regrouping on Friday ahead of the expected final battle for the hometown of fugitive fallen strongman Moammar Gadhafi, after suffering heavy casualties.

An Agence France Presse correspondent at Hassan, some 60 kilometers (35 miles) west of the coastal city, one of Gadhafi's holdout strongholds, said National Transitional Council (NTC) forces were preparing there for the final assault on Sirte.

Fighters loyal to Libya's new rulers were inside Sirte, the country's military said on Thursday, after a massive convoy of its forces launched a bid to take Moammar Gadhafi’s hometown.

"Misrata's thwar (fighters) arrived at the al-Gharbiyat Bridge inside Sirte," the Misrata Military Council said in a statement.

French President Nicolas Sarkozy, flanked by British Prime Minister David Cameron, dedicated Thursday the two leaders’ landmark visit to post-Gadhafi Libya to all those who want a “free Syria.”

The French president said toppled Libyan despot Moammar Gadhafi remained a "danger" and that there was a "job to finish" in eliminating the remaining strongholds of his forces.

Iran's ambassador to Libya has returned to the war-torn country in hopes of "deepening bilateral cooperation," the official IRNA news agency reported Thursday citing a foreign ministry statement.

"Our country's ambassador, Ali Asghar Naseri ... has returned to Tripoli and resumed his activities under the new political climate," the foreign ministry statement said.

The head of Libya's National Transitional Council confirmed that French President Nicolas Sarkozy will be among leaders visiting Tripoli on Thursday.

Mustafa Abdul Jalil confirmed to Agence France Presse that Sarkozy would visit, and added that "we say to the leaders coming tomorrow that they will be safe."