ISLAMABAD -  Militants overrun a Pakistani police academy and kill 100 officers. An Indian spy and her accomplice waltz in a glitzy flat in Islamabad to celebrate the success of their mission.

This is a scene from Waar (“Strike”), Pakistan’s first big-budget movie which opened this month to enthusiastic audiences in the nuclear-armed South Asian country of 180 million.

Filmed with the support of the all-powerful military, the movie depicts every volatile aspect of Pakistan’s rocky relationship with its nuclear arch-rival India.

Even in Pakistan itself, Waar is denounced by some liberals wary of what they see as fiery nationalistic rhetoric and scenes demonising India. The narrative is simple and packed with action. Indian villains team up with Islamist militants to plot spectacular attacks across Pakistan. Pakistani security forces jump in and save the day. “Like any other action film, we wanted to show the triumph of good over evil,” said director Bilal Lashari, 31. “And we wanted to do it with a great amount of spectacle and scale.”

Politics aside, Waar is fun to watch. Helicopter gunships whizz over mountains and commandos lay siege to militant sanctuaries in Pakistan’s picturesque, lawless tribal regions.

“The army was great in that they gave us a lot of logistical support,” Lashari said. “All the scenes with the helicopters and the mountains - they couldn’t have been done without the army.”

Though yet to be screened in India, the film serves as a reminder of tensions between the neighboring states, which have fought three wars since independence from the British in 1947.

India and Pakistan trade accusations of staging cross-border attacks and supporting militants in the disputed region of Kashmir, where violence has seen a resurgence in recent months.

The movie has proved hugely successful. On a recent viewing in a packed cinema in the capital, attendees leapt to their feet to applaud patriotic scenes.