Translate the following sentence to French:
The unique relationship that binds the European Union and the United States is one of the strategic foundation stones of the European Union.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
par écrit. - La relation unique qui lie l'Union européenne et les États-Unis constitue l'un des socles stratégiques de l'Union européenne.