Why do you think the R5 was developed in China? Renault have been quite open about all the improvements they had to make to their processes, development centres and factories in France to make it. The Twingo was partially developed in China.

The EV batteries are sourced from Ampere and LG (in the EU) and the EESM from Valeo (in the EU).

Sharing platforms isn't something EU manufacturers are opposed to, but they do not want to be dependent on Chinese supply chains. That is the crux of ExChina, especially as the majority of an EV's value is derived from the battery and powertrain.