It appears the French are a bit peeved with Nolan for not including their contributions further. I think what they fail to realize was this movie was not about the battle but rather the evacuation itself. Throughout the movie no real information about the battle is given just that the BEF is encircled along with French soldiers. The film does at times commend the French for their contributions and bravery. Moreover this is a British war film written and directed from the British perspective. The French are more than welcome to create a big budget war film chronicling their perspective as well. I will write my own spoiler free extended review later on but thought this negative reception was interesting and frankly disappointing. It seems the French maintain the massive chip on their shoulder.
The Russians being chuffed about the movie is just laughable really. They were too busy playing games with Hitler and ruining the mid and late 20th century with their communist expansion.