How is "However, my joy is tempered by the fact that the UK will not join us." said in German?

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
Meine Freude wird jedoch durch die Tatsache getrübt, daß Großbritannien sich uns nicht anschießen wird.