There is also talks of a US Navy ship in Black Sea. One ship is allowed through Bosporus. Someone said CVN Bush, but is to big for the Bosporus!!
http://www.aftonbladet.se/nyheter/article18486704.ab
The USS CVN Bush are in Greece with escort ships in other harbors.
According other info is following Russian troops on Crimea:
810 Naval Infantry Brigade based in Simferopol
31 guards Airborne Brigade from Ulyanovsk.
22 Spetsnaz Brigade from Aksaj, near Rostov
18 Motor Rifle Brigade from Khankala, Grozny
All units used during several years in Afghanistan and Chechnya.
Helicopter army bases are in Rostov-on-Don, Budyonnovsk and Kornevo. Plus MVD and border troops helicopters and units.
All units is recognized with special equipment such as Kevlar helmets (only special units have these) and rifle special pointing equipment. Special Forces wear typical berrets. Several typical cossacks are visible on Crimea. Also part of 810 Naval Brigade.
Following units are near Ukrainan border:
Bryansk
several airborne units
Belgorod
15 Motor Rifle Brigade from Samara Rochinskiy
23 Motor Rifle Brigade from Samara
9 Motor Rifle Brigade from Nizhny Novgorod is loaded on train to unknown
Brigade in Mulino Dzerzhinsk are another possible.
Air units in area Western and Central OSK have performed exercises and air tanking, and are ready.