Air strikes against IS 'not working' - is it true?

The Syrian regime says two months of US-led strikes have failed to weaken the Islamic State group in Iraq and Syria. Is it right - or are other motives at play?

The US-led coalition has carried out nearly 300 air strikes against Islamic State (IS) militants since September, killing nearly 800 IS fighters in Syria in the process.

Coalition air strikes have been central to defending what are seen as strategically important locations, including the Haditha dam in Iraq and the Turkish border settlement of Kobane.
Air Strikes Against is 'Not Working' - Is It True by Thavam Ratna