The Renault Laguna, Scenic, Megane and Megane Coupe-Cabriolet were designed by Renault, built by Renault factories in France, and have all earned five stars in European NCAP tests. They have also all been banned by China's General Administration of Quality Supervision Inspection and Quarantine for "serious safety risks" and inadherence to technical regulations.
Renault didn't even sell a thousand cars in China last year, and the GAQSIQ didn't specify what could have been so wrong with those four cars that they deserved a ban. It has only said that Renaults "have many times revealed quality problems" and urged the company to check its Chinese-market cars thoroughly. We have no idea what the technical and safety issues could be, but based on some of the Chinese cars being sold... well, you know the one about glass houses, right?
[Source: Automotive News, sub. req'd]