What is the reason for Britain's "Britain's withdrawal from the EU" in Russian-British relations?

The fundamental reason for Britain's withdrawal from the EU stems from the influence of traditional British continental egalitarianism thinking and EU integration thinking, that is to say, everyone's goals are fundamentally different, so the short-term cooperation right should be opportunistic! Anyone familiar with British history knows that, except the Irish in the north who are disobedient and disruptive, most foreign problems come from the European continent across the English Channel.

Whether it is the Ninth Legion of the Roman Empire or the Hundred Years' War between Britain and France, it is a war or harassment of Britain, an island country that is drifting away, after the rise of great powers on the European road. Therefore, the British tried their best to seek a relatively balanced foreign policy, that is, the principle of continental balance of power.