France is open to discussing extending the protection offered by its nuclear arsenal to its European partners, President Emmanuel Macron said in an address to the nation on Wednesday, in which he warned that Europe must face up to the threat from Russia.

France and Britain are Europe's only two nuclear powers.

"Our nuclear deterrent protects us: it's complete, sovereign, French through and through," Macron said on Wednesday in his televised speech.

"But, responding to the historic call of the future German chancellor, I have decided to open the strategic debate on the protection of our allies on the European continent through our (nuclear) deterrence," Macron said.

German Chancellor-in-waiting Friedrich Merz has questioned whether NATO would remain in its "current form" by June and advocated talks with France and Britain about an expansion of their nuclear protection.

France's nuclear deterrence strategy has hitherto been defensive and meant to protect the country's own vital interests.

In his televised speech, Macron also said France would have to spend more on defense and would continue to help Ukraine. He acknowledged voters' concerns over Russia and over the new U.S. administration's upending of the international order.

He said that he wanted to believe that the United States "will remain at our side," while adding that Europe had to be ready if that was no longer the case.

"You are, I know, legitimately worried about the current events, which are disrupting the world order," Macron told voters.

"Russia has become a threat for France and Europe," he said, adding that "to watch and do nothing would be madness."

European countries are scrambling to boost defense spending and maintain support for Ukraine after President Donald Trump froze U.S. military aid to Kyiv and fueled doubts about Washington's commitment to its European NATO allies.

France's nuclear deterrent is air- and sea-based, with Rafale fighter jets and nuclear submarines being able to strike at any time, on the instruction of the French president alone.

According to the Federation of American Scientists, the United States and Russia now possess approximately 88 percent of the world's total inventory of nuclear weapons. France has an estimated 290 nuclear warheads and the United Kingdom 225, it says.

Macron's address comes amid a flurry of European diplomacy to shore up support for Ukraine and try to mend ties between Washington and Kyiv after an acrimonious meeting between Trump and President Volodymyr Zelenskyy in the Oval Office last week.

Former Russian President Dmitry Medvedev early on Thursday mocked Macron's warning that Russia posed a threat, saying the French leader posed no threat at all and would not be missed once he stepped away from public life.

(With input from Reuters)