The Pikey is almost certainly speaking with all potential aircraft manufacturers, it's what he's paid to do. But whether the talks will progress into orders, assuming the aircraft are developed and deliverable, is another thing. But will other manufacturers play ball? Unlikely. He's going to be screwed over whatever he buys next. And then there's the cost of retraining - will RYR's pilots be able to afford it?
As for Russians and Chinese building to Western standards. No problem, they have excellent designers and engineers. They've just never had a large enough market for Western style aircraft - until now. They are not going away and every day they improve their products. Their engineers are every bit as capable as Boeing's and they have the full support of their governments - If the same support happens for Boeing or Airbus someone will shout "Foul!"