Russian invasion of Ukraine. Before this, the European polity were stuck in this "End of History" mindset where great power conflict was a relic from the past and everything could be solved through negotiation and institutions. The sooner laypeople realize we're in the Second Cold War (as the foreign policy types have) the less these kinds of moves (banning TikTok, restricting Nvidia exports to China) will come as a surprise, and you may even start to appreciate them.