Donald J. Trump may be new to politics, but he has already demonstrated a mastery of the dark art of creating haunting campaign videos packed with imagery of violence and war.

Tarring Democrats with responsibility for mayhem across the world, Mr. Trump has released a new ad on Instagram that shows images of President Obama playing golf; Hillary Rodham Clinton dancing with her husband, former President Bill Clinton; “Jihadi John,” the masked, knife-wielding militant seen in several gruesome Islamic State videos; and a Humvee going up in flames.

“Politicians are having fun on our dime while the world is burning,” the ad reads.

Mr. Trump captioned the video simply, “Not under my watch.”

The video echoed ads that former President George W. Bush used in his re-election campaign in 2004. He was criticized at the time for invoking images from the Sept. 11 attacks, including footage of the charred World Trade Center, to make the case that he was the right person to keep America safe in a dangerous world.

However, the ads did draw attention to Mr. Bush’s cause, and his bid was ultimately successful.

Mr. Trump has said little so far about how he would address unrest in the Middle East. He has indicated that using military force to capture or destroy the oil supplies that the Islamic State relies on will be central to his strategy.

“Take the oil, knock the hell out of them,” Mr. Trump said this week.