Islamic State militants have posted a second video online purportedly showing captured British photojournalist James Cantlie, who states that the U.S. and Western nations have underestimated “the strength and fighting zeal” of the group.

In the 6-minute video, a man in an orange jumpsuit who identifies himself as Cantlie says he was abandoned by his government and is a “long-term prisoner of the Islamic State.”

The man quotes a post on a website by former CIA officer Michael Scheuer, who said that Obama does not have a solid plan to defeat ISIS.

The man also calls the U.S. effort to combat ISIS an “ill-advised foray” and says Western governments were “caught napping by the sheer speed of the Islamic State’s growth.”

At the end of the video, the man alludes that there will be more videos to come.

Cantlie was kidnapped by militants in Syria in 2012.  To date, ISIS has beheaded three hostages on video -- American journalists James Foley and Steven Sotloff, and David Haines, a British aid worker.