At the heart of NATO, the world’s longest-standing security alliance, is the notion that an attack on one is an attack on all. But with many in Europe doubting a Trump-led United States will really come through for them,

President Emmanuel Macron has said he will launch a strategic dialogue on extending the protection offered by France's nuclear arsenal to its European partners.

With the U.S. showing signs of retreating from its traditional security role, Macron has intensified efforts to strengthen European defense, including proposals to expand Frances

With U.S. security commitments in question, discussions grow around France’s nuclear deterrence strategy for the continent.

European leaders showed a cautiously receptive ear to President Emmanuel Macron's proposal to debate extending the French nuclear umbrella to Europe on Thursday, though some were reluctant to draw a line under years of U.