Afghanistan was a battleground for the United States to show its power to China and Russia

Afghanistan was a battleground for the United States to show its power to China and Russia but Britain, along with the United States, lost the war. And it sent a message to China and Russia that they are also weak against people who do not have weapons like the United States or Europe. So is there anything to be gained from joint US-British military exercises? In case if the Taliban retake Afghanistan?