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The Latest on the development in the Syrian civil war and the aftermath of the assassination of Russia's ambassador to Turkey (all times local):

11:30 a.m.

Russian Foreign Minister Sergey Lavrov says the assassination of the Russian ambassador to Turkey makes Moscow even more determined to press ahead with Syrian talks that will offer "no concessions to the terrorists."

Lavrov is hosting the foreign ministers of Turkey and Iran in Moscow on Tuesday in what was expected to be a major meeting to discuss the Syrian crisis.

Lavrov and the visiting Turkish Foreign Minister Mevlut Cavusoglu on Tuesday laid flowers to the portrait of Ambassador Andrei Karlov who was shot dead at an exhibition in Ankara.

The Russian minister said in televised comments that President Vladimir Putin and President Recep Tayyip Erdogan late on Monday "agreed this tragedy makes us more decisive in fighting terrorism and makes our today's meeting even more important."

Lavrov says Moscow is willing to seek agreements that will improve the humanitarian situation in Syria and help political procession but "will not offer any concession to terrorists."

Cavusolgu who told Lavrov at the start of the meeting that the attack happened when he was on his way to Moscow offered his condolences and said that "Turkish people are mourning this loss as much as Russia and the people of Russia."

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10:55 a.m.

The International Committee of the Red Cross says it has overseen the evacuation of 25,000 people from eastern Aleppo since the rebels effectively surrendered the Syrian rebel enclave under an Ankara- and Moscow-brokered deal.

The figure was provided by Robert Mardini, the ICRC's Mideast regional chief, who posted it on Twitter. Ingy Sedky, the ICRC spokeswoman in Damascus, told the Associated Press that Aleppo "evacuation (are) not over yet" and that there are "still thousands remaining" in eastern Aleppo.

Meanwhile, the Lebanese militant group Hezbollah says Syrian army troops are to enter the rebels' last foothold in Aleppo later in the day, marking the return of the entire city to government control.

Hezbollah, which is fighting alongside Syrian President Bashar Assad forces, warned the remaining residents in the rebel enclave to leave "as quickly as possible."

The warning was distributed through Hezbollah's militia's media arm on Tuesday.

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9:30 a.m.

The last Syrian rebels and civilians are awaiting evacuation from the remainder of what was once a rebel enclave in eastern Aleppo, a day after the U.N. Security Council approved sending observers to monitor the exodus.

The Britain-based Syrian Observatory for Human Rights says that more than 15,000 people, among them 5,000 opposition fighters, have left the enclave since the rebels effectively surrendered the area under an Ankara- and Moscow-brokered deal. It's unclear how many remain.

In Moscow, foreign ministers of Russia, Turkey and Iran are meeting on Tuesday to discuss Syria, but the talks are likely to be overshadowed by the assassination of Russia's ambassador to Turkey the previous night by an Ankara policeman, who after killing his victim cried out: "Don't forget Aleppo! Don't forget Syria!"