Is there any way to check the enemy's firing range or Overwatch range?

I am pretty early into the game and got one of the council missions for rescuing a VIP. While escorting him back to the ship, an Alien appeared out of nowhere and took position in Overwatch mode with no cover between the Alien and the VIP. I wasn't sure whether the VIP was in firing range of the alien, took a chance to move him to better cover and got shot down.

While in this case, the Alien wasn't too far away from the VIP, it was far enough that I was debating that he might be out of range. Is there any way to check the range or other in-game cues to go by to determine the range of the Alien?