With the recent establishment of a neo-caliphate in the Iraq and parts of Syria in Middle East, neighboring countries has gone alerted by the danger IS poses in the region. They’re indeed battle-hardened as you say but the main reason behind their success is they believe in what they fight and die for.
They believe in Allah until the end and nothing will change their brain-washed mentalities. They are ready to die whenever the time comes for them because they think they will be rewarded for their efforts to spread the Jihadist movement.
Iraqi Army has proved unsuccessful and the Syrian Army is nothing better since there has been a civil war for 3 years now, which is enough to weaken the Syrian Army beyond being able to defend their country from the real danger. Not the people wanting freedom… But the people want to bring Sharia code. People who don’t tolerate others…
US has been late to support the Iraqi government and because of this Iraqi government is paying a immense strategic cost as one of their biggest-oil-reserve-containing-province, Mosul has been captured. IS has not been satisfied though. As I’ve said they will fight until the end but there will be lots of multi-layered obstacles for them.
The Peshmerga is a big one. The Peshmerga, or the Kurdish forces has been a long-standing regional protector of the semi-autonomous Kurdistan region and has lots of combat experience and skills from fighting the Turkish government for many years. They have proven successful but with the US intervention, their achievements will only get bigger and bigger.
IS’ other problems include the Western aids to defense groups against them and another ironic enemy they has (except normal people) are other extremist Islamic groups!
When al-Qaeda announced that it had no ties with IS and the sole representative of al-Qaeda in Iraq was al-Nusra, this sparked up lots of violence and caused tons of bloodshed in the region as varying extremist groups pledged alliance to IS and others sided with al-Qaeda. This even can potentially turn into a Sunni x Sunni war as it has been clear that IS has no boundaries.
Other extremist groups has called the caliphate a “twitter-caliphate” and mocked with it, denying its legitimacy and not acknowledging it.
All I hope is that IS doesn’t spread to Jordan or Lebanon because especially Lebanon has a relatively small army and this might cause the spread of terrorism to Israel, which you know how usually ends… Lots of people dead.
I think a multinational coalition force as in the Gulf War could be able to suppress the IS offensive, launch a counter-offensive and eradicate the brain-washed extremist once in for all.