Rebel forces in Syria have seized control of most of the city Aleppo after launching a surprise offensive against government forces, a war monitor reported on Saturday as Russia says it deployed fighter jets against rebels in Syria. An alliance of rebel factions led by the Islamist militant group Hayat Tahrir al-Sham (HTS) has advanced deep into Aleppo and now controls the majority of the northern city, the Syrian Observatory for Human Rights said. The insurgence, which began on Wednesday, appea