I have been following this for a while...

The Chinese airplane may not even get western certification...it was not designed from the ground up to specifically meet FAA requirements. It's capacity and performance is not sized to western RJ markets, but rather to a specific niche in China's domestic market. Also this airplane is essentially a "practice" airplane...China has reorganized their aviation industries (all government controlled) with the intent of ramping up to produce large airliners. This RJ is a first step to that end, they don't care whether they sell them in the US.

The Russian RJ is similar in that it is targeted at domestic markets...there is a shortage of good home-grown airliners in russia, and there has usually been a HUGE import penalty on Boeings and Arbii. It looks like it will get FAA certification (reciprocal based on euro certs), but I'm not sure it will be a strong competitor to bombardier and embraer.

As for the Mitsubishi...the design details are very exciting, they improve on many of the traditional RJ downfalls. It's safe to assume that the Japanese can make good on their intentions...expect to see these here in the US.