The US has warned that greater military co-operation between EU countries would be a “dramatic reversal” of three decades of transatlantic defence integration, in the latest sign of the fraying relationship between Washington and Brussels.
In a letter seen by the Financial Times, Washington threatened retaliation if the Europeans pressed ahead with rules that it said would restrict the involvement of US companies in pan-European military projects.
The correspondence was sent this month to Federica Mogherini, the EU’s top diplomat, by Ellen Lord, US under secretary of defence, and Andrea Thompson, under secretary of state.
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