It wouldn't have the same effect, regardless of country. All countries have their trauma moments, but the reason 9/11 was so important was because the victim, the United States, was the world's super power. When the US walks, the world shakes. If you don't believe me, look at how 9/11 and the financial crisis changed the world. For every other country, say, Russia, you'd probably get less sympathy. Russia has been hit by a string of terrorist attacks by Chechen rebels, all of them VERY brutal, but it's not too newsworthy. If you're China, then you'll definitely get a "you deserved it" every now and then (didn't that happen during the Sichuan earthquake?).