 People are worried World War 3 might happen. Basically, these countries are in a sorority called NATO, and the most important part of NATO is Article 5, which says if one of the sisters is attacked, then all of them are attacked, like Denmark will be ready to throw hands if anyone outside of the house comes from Canada. Meanwhile, Russia, who is most definitely not NATO, happens to be picking on Ukraine, who is also not NATO, but Ukraine happens to be friends with a ton of the girls who are in NATO, and though they can't get into a fight on her behalf because she's not in the org, they do pay for her self-defense classes on the low. So, let's say one day Russia is fighting with Ukraine, and maybe Russia's tired because she stayed up all night studying for her dictatorship exam. Maybe she just has bad aim. Regardless, Russia ends up punching Slovakia instead of Ukraine. Well, Article 5 activated. Now the entire NATO house is rolling deep coming for Russia, and Russia's gotten all of her friends involved too, and before you know it, the whole campus is involved in a massive riot, and that riot is World War 3. Plus, they have nukes.