Pakistan, May 31 -- US Defense Secretary Pete Hegseth took another swipe at Washington's NATO and European partners on Saturday, saying those that do not hike defence spending sufficiently "will face a clear shift in how we do business".

NATO members pledged last year to ramp up defence-related spending to five percent of GDP but, despite increased efforts, many states say they may not be able to reach that target.

"For too long, polite pleas from our European allies to spend more on their own defence fell on deaf ears," the Pentagon chief said at a defence summit in Singapore.

"They are finally playing catch-up," Hegseth said in a speech at the annual Shangri-La Dialogue conference.

"Allies who refuse to step up and carry their own w...