"America will meet its responsibilities, but if your nations do not want to see America moderate its commitment to this alliance, each of your capitals needs to show support for our common defence," Mr Mattis said.
The US defence chief added that investing in common defence was vital, and cited the threats that have emerged since 2014, such as the annexation of Crimea by Russia and the rise of so-called Islamic State in Syria and Iraq, on the southern border of member Turkey.
Nato Secretary General Jens Stoltenberg said alliance members were already increasing their contributions.
And UK Defence Secretary, Michael Fallon, said he had urged countries to increase their spending, even if they could not meet the 2% target.
"An annual increase that we're asking them to commit to would at least demonstrate good faith."
The meeting was held amid concern over the
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