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TOPSHOT - Refugee children arrive a the Turkish border crossing gate as Syrians fleeing the northern embattled city of Aleppo wait on February 6, 2016 in Bab al-Salama, near the city of Azaz, northern Syria.
Thousands of Syrians were braving cold and rain at the Turkish border Saturday after fleeing a Russian-backed regime offensive on Aleppo that threatens a fresh humanitarian disaster in the country's second city. Around 40,000 civilians have fled their homes over the regime offensive, according to the Syrian Observatory for Human Rights monitor. / AFP / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)
TOPSHOT - Refugee children arrive a the Turkish border crossing gate as Syrians fleeing the northern embattled city of Aleppo wait on February 6, 2016 in Bab al-Salama, near the city of Azaz, northern Syria.
Thousands of Syrians were braving cold and rain at the Turkish border Saturday after fleeing a Russian-backed regime offensive on Aleppo that threatens a fresh humanitarian disaster in the country's second city. Around 40,000 civilians have fled their homes over the regime offensive, according to the Syrian Observatory for Human Rights monitor. / AFP / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)

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Karin Von Hippel, Director-General of London-based think tank RUSI, tells Christiane Amanpour why she's worried about a power vacuum in Aleppo, Syria.

West must 'put a lot of pressure' on Russia over Syria

Karin Von Hippel, Director-General of London-based think tank RUSI, tells Christiane Amanpour why she's worried about a power vacuum in Aleppo, Syria.