Source that you wouldn’t be allowed to kill unarmed enemy soldiers? Imagine a scouting team doing reconnaissance, surely you’re allowed to attack and kill them?

Article 3 of the Geneva Convention.

Laying down your arms is generally considered an expression of surrender and renders protection.

Also, who sends scouts unarmed? They should at least have a sidearm.

Laying down arms as an action is different to being unarmed.

And it was a hypothetical, there are a lot of situations where you can kill unarmed military personnel legally.

You can just bomb military barracks full of sleeping unarmed people legally for example.

By that logic, PA had fighter jets.

And no, limiting food and medical is not a war crime if the source being limited is from the captor and matches the treatment of their own troops.