Right now it seems as though Simferopol International Airport, the Building of the Supreme Council of Crimea and Belbek Airport have been seized by unknown special forces.
204th Tactical Aviation Brigade is based out of Belbek Airport; which flies 39x MiG-29s.
Sources:
http://www.interpretermag.com/ukraine-liveblog-day-7-decoding-documents-indicting-dictators/#2200
http://izvestia.kiev.ua/article/60373
http://www.theguardian.com/world/2014/feb/26/ukraine-new-leader-disbands-riot-police-crimea-separatism
http://flot.com/news/navy/?ELEMENT_ID=161477
http://www.bbc.com/news/world-europe-26359150
http://www.boston.com/news/world/europe/2014/02/26/reports-vladimir-putin-orders-test-combat-readiness-troops-central-western-russia/xrWktjD2Fi2Ad0DRoS5apN/story.html
http://hosted.ap.org/dynamic/stories/E/EU_UKRAINE?SITE=AP&SECTION=HOME&TEMPLATE=DEFAULT&CTIME=2014-02-26-19-30-20
http://www.aljazeera.com/news/europe/2014/02/201422785139294624.html
http://www.businessinsider.com/armed-men-airport-ukraine-crimea-2014-2
http://johngaltfla.com/wordpress/2014/02/27/02-27-breaking-2000-et-in-crimea-sevastopol-and-simferopol-airports-surrounded-by-unknown-military-force/