Syria's Response Coordination Group says the forced migration gained momentum in Eriha, Jabal Zawiya and Saraqeb regions of Idlib province due to intensified attacks.
Moscow has allowed the Assad regime to attack Idlib despite a ceasefire as it prefers to back strongmen it can control, not revolutions.
Seven of those killed in regime and Russian strikes in Sarmeen town of Idlib province were all members of one family, Syrian Observatory for Human Rights says.
The Britain-based Syrian Observatory for Human Rights, an opposition war monitor, said rebels withdrew from Idlib province's Maarat al Numan town late on Tuesday.
Local media and the Syrian Observatory for Human Rights said Syrian regime forces took control of the city of Maarat al Numan located in the northwestern province of Idlib.
Renewed violence tightened the noose around Syria's last major rebel-held bastion and deepened an already dire humanitarian crisis.
As northern Syria continues to be the theatre of a violent war waged by the Assad regime, many surviving artists on the ground are turning empty rocket and bullet shells into impressive artwork.
Turkish President Erdogan says the situation in the embattled Idlib province of Syria is an indication that the Syrian regime did not comply with the ceasefire initiated by Turkey and Russia.
Idlib has come under mounting bombardment in recent weeks, displacing tens of thousands of people in the northwestern province, despite a truce brokered by Turkey and Russia.
The strikes which hit Jubass village in Idlib province killed at least eight civilians, Syrian Observatory for Human Rights said. The Syrian regime has captured at least 35 residential areas in the past four days in the northwestern Idlib province.
War monitor SOHR says regime push "is an attempt to get closer to Maaret al Numan" in Idlib province which Russia and regime have intensely bombed fuelling exodus of Syrians, many of whom Turkey's President Erdogan says are marching towards Turkey.
In a joint statement, the trio agrees to coordinate efforts to ensure Syria's security and stability after a trilateral summit in the Turkish capital, Ankara.
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