President Nicolas Sarkozy declared Monday that the Islamic burqa is not welcome in France, branding the face-covering, body-length gown as a symbol of subservience that suppresses women’s identities and turns them into “prisoners behind a screen.”

But there was a mixed message in the tough words: an admission that the country’s long-held principle of ethnic assimilation — which insists that newcomers shed their traditions and adapt to French culture — is failing because it doesn’t give immigrants and their French-born children a fair chance.

In a high-profile speech to lawmakers in the historic chateau at Versailles, Sarkozy said the head-to-toe Muslim body coverings were in disaccord with French values — some of the strongest language against burqas from a European leader at a time when some Western officials have been seeking to ease tensions with the Muslim world.

Some Muslim leaders interpret the Quran to require that women wear a headscarf, niqab or burqa in the presence of a man who is not their husband or close relative.

France is home to Western Europe’s largest population of Muslims, estimated at about 5 million. A small but growing group of French women wear burqas and niqabs, which either cloak the entire body or cover everything but the eyes.