US President Donald Trump says he expects Japan to pay more to host US bases.
Trump made the comment during talks with NATO Secretary General Jens Stoltenberg in London on Tuesday.
Trump said he had asked Prime Minister Shinzo Abe, who he described as "a friend of mine," to help the United States because Japan is a wealthy nation. Trump said Abe is "going to do a lot."
Japan and the US will discuss the cost renewal next year.
Trump also urged other NATO member countries to increase their defense spending. He said the military alliance is unfair for the US because it is paying a disproportionate amount.