French President Emmanuel Macron said Monday that France will expand its atomic arsenal and could deploy nuclear-armed aircraft to allied countries for the first time, as he unveiled an unprecedented plan to bolster security on the continent.

Speaking from the Ile Longue nuclear submarine base as the clock ticks on his presidency, Macron announced that eight European countries including Germany, Poland, Sweden and the U.K. had agreed to participate in what he called a ¡°forward¡± nuclear deterrence scheme.

¡°Today more than ever, independence cannot mean isolation,¡± Macron said in his 50-minute speech, with one of France¡¯s four ballistic missile submarines in the background.