The world is made up of two different kinds of countries, countries that are Great Powers and countries that are so-so powers.
If you live in a country that's a Great Power, you get up in the morning, shower, shave, get dressed, have breakfast, go to work, come home, read the paper, eat supper, put on your pajamas and maybe watch a little television.
Sometimes, right in the middle of your favorite show, you might get a call from the President telling you that a guy on the next block started a business in a foreign country somewhere, that somebody is trying to take it away from him, and that you have to go get it back for him. He explains about how Great Powers have 'interests' and now you finally understand what 'having interests' really means.
So you get dressed, get your gun from the closet, drive to the airport, fly to the country where the guy has his business, shoot whoever took if from him and, if you didn't also get shot, drive back to the airport, fly home, maybe catch the end of your favorite show, and, go to sleep.
If you live in a country that's a so-so power, everything is pretty much the same, except that you get to watch all your favorite shows and you hardly ever have to shoot anybody unless they try to shoot you first.
And that's how the world works. Now you know too.