The EU cannot afford to finance Ukraine's military efforts as U.S. financial aid is no longer guaranteed, Hungarian Prime Minister Viktor Orban said on Friday after the leaders of 26 EU countries signed a statement voicing support for Ukraine without Hungary.

Orban, an ally of U.S. President Donald Trump, who is also cultivating ties with Moscow, told state radio that his government would launch a domestic "public consultation" on Ukraine's European Union accession in the coming weeks.

The state-funded political campaign will come as Orban, in power since 2010, faces elections in 2026 with the economy just clambering out of an inflation crisis and with a surging new opposition party posing the strongest challenge yet to his rule.

European leaders on Thursday backed plans to spend more on defence and continue to stand by Ukraine in a world upended by Donald Trump's reversal of U.S. policies.

The European Union's defence summit in Brussels took place amid fears that Russia, emboldened by its war in Ukraine, may attack an EU country next and that Europe can no longer rely on the U.S. to come to its aid.

European leaders on Thursday backed plans to spend more on defence and continue to stand by Ukraine in a world upended by Donald Trump's reversal of U.S. policies.

Trump has said Europe must take more responsibility for its security. On Thursday he cast doubt on his willingness to defend Washington's NATO allies, saying that he would not do so if they are not paying enough for their own defense.

His decision to shift from staunch U.S. support for Ukraine to a more conciliatory stance towards Moscow has deeply alarmed Europeans who see Russia as the biggest threat.