There is a very simple demonstration of the world approach to the United States.
Economic
Many economies voluntarily tie them selves to the US economy by investing in the US commodities market and stocks. Norway's Pension Fund, Chinese Development Fund, Dubai D.F., etc. In addition there is cross borrowing, US bank borrows from one country to loan money to another or internally (which then ends up off shore sooner or later.) The interdependency creates a safety net so slowing of growth doesn't turn into a recession or another "Great Depression".
Military
Country ask for US aid or US enters combat without being asked, other countries complain. US doesn't enter combat, other countries complain. US pays all the bill for UN, everyone complains. US doesn't pay the UN bill, other countries complain.
The US isn't perfect, it is a nation behaving like other nations do, or would if in similar circumstances. France, Britain, Germany, Russia, and China all have their share of modern military involvement where you could probably find fault with the greater powers logic. The fact of the matter is, if a nation has power to use its military for its benefit it does. I am not saying this is the way it should be, just that it is the way it is.
The modern day interdependency of both economy and defense is what prevents these powers from going to war with one another and killing millions of people.
Every other country uses it military in one way or another to get what it wants. Poland helps in Iraq to gain favor. UN peacekeepers stand around as a group of nations decide not to get involved but to be close by as a threat to another power they don't like. If any of you really believe that any UN peacekeeping group is sent by the home countries for human rights, you are naive.
I would cite regulation, but I know you will simply ignore it.