[AdmSmith]

Russian S-400 AIR DEFENCE heading to UKRAINE

http://www.liveleak.com/view?i=c62_1393673617

Perhaps plans for more than Crimea?

The real purpose of Russian troops in Ukraine is to undermine the credibility of Nato
http://www.telegraph.co.uk/news/worldnews/europe/ukraine/10669826/Ukraine-Putins-Crimea-aim-is-to-make-the-West-look-weak.html

[annalex]

The real purpose of Russian troops in Ukraine is to undermine the credibility of Nato

We cannot be sure of that. Obama's cowardice surely has that effect, but the RF's purpose is what it appears to be: fomenting secession of the Crimea and possibly other regions of Ukraine.