The real problem with NATO military spending is not underspending by the rest of the members, but the obscene level of overspending by the USA.
The real problem is excessive military spending by the USA

The real problem with NATO military spending is not underspending by the rest of the members, but the obscene level of overspending by the USA.
We find out June 7th if the Liberal government stands firm or caves to Trump’s pressure to double our defence spending.
Let Prime Minister Trudeau know you support robust and ongoing review of Canada’s arms exports through a new parliamentary committee.
Ceasefire.ca evaluation of government performance gives failing grade on arms trade transparency, NATO sabre rattling and missed opportunity on UN peacekeeping.
Rideau Institute President testifies at the National Defence Parliamentary Standing Committee
Open letter calls on PM to rescind export permits for Saudi arms deal.