Why has civil war reignited in Syria?

The geopolitical struggles across the Middle East have once again been thrown into turmoil.

In Syria, rebels have swept into Aleppo, launching their largest assault on President Assad in years.
 
Now, the Jihadist group, HTS, have now reignited civil war across Syria, leaving the country on the brink of yet another humanitarian crisis.

So, who are the rebels? What do they want? And what’s the wider impact?

Senior International Correspondent, John Irvine tells Lucrezia Millarini what you need to know...