NORAD- North American Air Defense command (part of the USAF). I guess probably the KGB keeps tabs on Nick too, as he"s (Nicholas II) a saint in the Russian Orthodox Church. Now to get a monitor on daughter number 4, red hair, five-nine, eyes blue, you know who- Anastasia!
EDIT:
The KGB (now the FSB) were involved in intelligence gathering, so they would pass on information to Santa about who had been bad or good rather than track his flight over Russia...
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