"War is like global warming, it's pretty bad, it's a messy situation," Lee, 62, said.
The "Life of Pi" helmer said for his latest project, he researched from the perspective of the soldier as well as the people living in Iraq. He also interacted with those living in refugee camps.
"I feel bad for both of them. It's a really messy situation, you choose between dictatorship and chaos. Those young soldiers serving there are trained to fight but are confronted with situations where they do not know what to do," he said at an event, held in the city recently.
Lee, known for cinematic masterpieces such as "Sense and Sensibility", "Brokeback Mountain" and "Pi", has used groundbreaking technology in his latest movie, which is based on the acclaimed bestselling novel by Ben Fountain.
The cast includes Vin Diesel, Chris Tucker, Steve Martin and Kristen Stewart.
The story is told from the point of view of 19-year-old private Billy Lynn (played by newcomer Joe Alwyn) who, along with his fellow soldiers in Bravo Squad, becomes a hero after a harrowing Iraq battle and is brought home temporarily for a victory tour.
Sony Pictures Entertainment is releasing "Billy Lynn's Long Halftime Walk' in India on November 11.
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