How do I get the "Merry Christmas" achievement in DEFCON?

I have a feeling the new Merry Christmas achievement is going to become significant in a bit, and therefore I'd like to unlock it.

However, I have no idea how. The description doesn't help at all:

Nuke Santa and thereby end Christmas for everyone, for ever more

The obvious (nuking the North Pole) hasn't worked, so how would I go about frying Santa?

Solution 1:

Set your (computer's) date to December 24th and Santa will fly around the cities. Just wait until Defcon 1 and nuke him when you can get a clear shot. Watch out for silos and aircraft as they can destroy your nukes.

Solution 2:

The easiest way is to start a game with only one player - no AIs. This will force Santa to travel between your own cities, so he'll stay close.

Start the game, and place silos relatively close to your own cities. Wait for DEFCON 1, set the game speed to the slowest speed, and wait for Santa to go to a city close to one of your silos. At that point, launch a nuke directly next to your own city - zoom in to help you choose the target. The nuke will move there quite quickly, and Santa will get caught in the blast before he has time to move to the next city.