Where has he said he takes full responsibility? Or any responsibility? Find me one site, whether Western or Russian or any source.
He blames the West for part of it and low oil prices but never takes any responsibility at all or talks about his policies. He makes a vague reference in that video regarding 'heads of state' but that's it.
He also looks like he's going on full nutso mode:
Vladimir Putin in bizarre rant accusing the West of 'ripping out' Russia's claws - Mirror Online
http://www.cnn.com/2014/12/18/world/...ech-dougherty/
Putin blames Western sanctions for economic crisis | Fox News
Putin speech sparks more ruble volatility.
https://www.youtube.com/watch?v=2q5KBPHxkP4