Why did the P-3 Orion in "The Hunt for Red October" launch a torpedo at the Russian sub if they weren't at war

Question:
I was watching the Hunt for red october and an american P-3 launched a torpedo at a russian submarine (maybe a missile submarine), but the US and Russia weren't at war. Why would they do it? Wouldn't this start a war?

Answers:

why do airplanes make those white lines in the sky?

The plane that launched the torpedo wasn't a P-3 it was a TU-95 bear F anti submarine plane and said so in the movie. This plane fired it's torpedo at the red october to prevent it from defecting to the US. Watch it again and pay attention to the subtitles and the light shall shine upon your befuddled brain.

What instruments would indicate rudder movement?

Artistic license. It's fiction.

How do planes fly without flapping their wings?

It was a Soviet Tu-95 that lauched the torpedo. It was to prevent Red October (the Soviet missle sub) from defecting.

How old do you have to be to fly a airplane?

It is fiction.

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