Because they have got a policy to share platforms between vehicles amongst them as a part of their joint venture. Platform is nothing but the base structure of the vehicle . Eg. Duster and Terrano have almost identical suspension systems - they share a common platform, same thing with Nissan micra and renault pulse. read more
Renault has a 43.4% stake in Nissan, and Nissan a 15% stake in Renault. This cross-shareholding arrangement ensures that the two partners have the same interests and encourages them to adopt win-win strategies beneficial to both. read more
The Renault–Nissan–Mitsubishi Alliance is a Franco-Japanese strategic partnership between the automobile manufacturers Renault, based in Paris, France, Nissan, based in Yokohama, Japan, and Mitsubishi Motors, based in Tokyo, Japan, which together sell more than 1 in 10 cars worldwide. read more