A Putin forces soldier pled guilty to killing a Ukrainian civilian.

The civilian was talking on a phone while riding a bicycle, and The soldier was ordered to shoot the civilian to stop him from reporting on the presence of Russian soldiers.

At the time, the soldier was driving around in a seized civilian car. That would have limited what the civilian could have known and reported about the actions of the Putin forces.

But what if the situation had been different? What if the soldier had driven by in his tank instead? Is it considered a war crime to kill a civilian who seems to be acting as a scout for the enemy? Should it be? What are soldiers supposed to do in that situation?