Putin never gave that speech. It is an internet hoax.
http://www.snopes.com/politics/soapbox/putinduma.asp
Chechen Teen Bride Scandal Puts Putin In Bind
http://www.huffingtonpost.com/2015/05/19/chechnya-teen-bride-scandal-putin_n_7313162.html
Don’t think Sharia law is not there in full force, this is a recent scandal over there.
Personally, since Chechnya is on the outer reaches of Russia, I think they should let it go along with other similar states of Russia. They fought two wars there for what? Oil? I’m unsure. Russia already has lots of oil and they basically have a sort of puppet there in Kadyrov. Just letting these states go might have some effect on the demographics.