"No one but Europe will solve its defense problems," he said during a joint press conference with President Volodymyr Zelensky in Warsaw.Tusk’s comment comes amid growing calls for higher defense spending across NATO, a topic reignited by Russia’s full-scale invasion of Ukraine in 2022 and advocated for by incoming U.S. President Donald Trump. "Other countries should not pay 1.5 percent of their GDP for defense — this is not enough," he said, emphasizing that robust European defense contributions could help maintain friendly U.S.-European relations. On Jan. 7, Trump called for NATO’s spending target to rise to 5% of GDP, significantly higher than the current 2% goal. "If all European countries start taking their obligations in NATO seriously, I am sure America will be happy to cooperate with us," Tusk added.While the 5% suggestion has faced resistance, some NATO members are reportedly open to a more modest increase, potentially to 3% of GDP, Reuters reported on Jan.