Many Euros will up their spending beyond 3%, including indirect spending and research, already, so it's a moot point. they've also gotten serious about standardizing their equipment, like artillery, vehicles, aircraft, etc. 2% is just a minimum.
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In 2014, NATO agreed a 2% rate. I think about 11 members out of 21 achieved that. Why does the US choose to pay more than 2%?US has become an unreliable partner with constant shifts in political stances.
EU can’t depend on the US being there for them
They are the ones under a direct threat and should increase spending for their own defense