Russian President Vladimir Putin said in a telephone conversation with Turkish President Recep Tayyip Erdogan that he wants the offensive of the rebel coalition in Syria to end quickly, reported France Press, quoted by BTA.
"Vladimir Putin stressed that it is necessary to quickly end the terrorist aggression of radical groups against the Syrian state and fully support the attempts of the legitimate authorities to restore stability and constitutional order," the Kremlin said in a statement.
The two leaders will continue to communicate to "seek measures to resolve the crisis," the Kremlin also said, stressing that Putin and Erdogan noted that the "close coordination between Russia, Turkey and Iran is from key to normalize the situation in Syria".
Russia, which has intervened militarily in Syria since 2015, and Iran are the main allies of Syrian President Bashar Assad, and Turkey supports the rebels, notes Agence France-Presse.
Syrian rebels are now "at the gates" of Hama, the fourth largest city in Syria, said the Syrian Observatory for Human Rights, quoted by AFP.
The Syrian army said it was sending reinforcements to fight the rebels.
A coalition of rebels led by the radical Islamist group Hayat Tahrir al-Sham, which is the former Syrian branch of al-Qaeda, launched an offensive in northwestern Syria on November 27, capturing dozens of towns and much of Aleppo, which is the second largest city in Syria, and continued to move south.
The Syrian Observatory for Human Rights, a UK-based non-governmental organisation, said that some neighborhoods of Hama had been bombed and that many of the city's residents had fled because of the ongoing fighting.