The “Islamic State” (IS or ISIS) terrorist group has released a third video of John Cantlie, a British journalist held prisoner for two years, The Telegraph reported on Monday.

In the new video, Cantlie delivers a scripted propaganda attack against U.S. President Barack Obama's strategy in Iraq and Syria.

Cantlie, wearing an orange Guantanamo-style jumpsuit, delivers the words directly to the camera using a sing-song tone as if to undermine the message.

In it, he criticizes Obama's tactics of using airstrikes and proxy Kurdish and Iraqi ground forces against IS.

"Air power is good at taking out specific targets but it is not good at taking and holding ground," he said, sitting behind the same desk as before, according to The Telegraph.

"For that you need effective and disciplined troops and it's hard to see how this hotch potch army with a long history of underperforming is going to be any form of credible infantry," added Cantlie.

He said that organizing the Iraqi army into a proper fighting force would take months and dismissed the Free Syrian Army as "undisciplined, corrupt and largely ineffective".

Cantlie was first paraded in front of the cameras two weeks ago, promising a series of videos giving the real story of IS.

It was the first that had been heard from him since he was captured inside Syria close to the border with Turkey towards the end of 2012.

A second video was released last week in which Cantlie, 43, from West Sussex, said the American president was being sucked into Gulf War III, another unwinnable conflict.

IS has released several videos depicting hostages it has taken. It has released videos showing the execution of the American journalists James Foley and Steven Sotloff, as well as a video showing the murder of David Haines, a British aid worker.

Copycat groups have beheaded hostages in Egypt and Algeria, where French citizen Herve Gourdel was beheaded last week by an IS-allied group known as the Caliphate Soldiers.