PAK-FA to start operational testing in 2014 - The DEW Line

"In 2013 we are expected to wrap up its
preliminary tests and start operational
testing. In 2014, we are planning to start
official state tests," says United Aircraft
Corporation president Mikhail Pogosyan.
The first stage of those state trials should
be completed by 2015.

http://www.flightglobal.com/blogs/the-dewline/2013/04/pak-fa-to-start-operational-te.html