see url: http://www.un.org/documents/ga/res/45/a45r151.htm
Not a lot of country's respect this human right, especially the bigger and more aggressive nations. A lot of wars and military interventions lately have occurred without consuilting the UN Security Council, and aggression has been carried out without permission being granted, or UN Resolutions being deliberaty stretched and twisted when such permission or authority for such military intervention has been refused. Iraq, Libya, Afghanistan, Syria, Ukraine and many other countries in the Middle East and around the world come to mind as victims. A nation's perceived foreign economic and political interests are subordinated to selfishness, and short-termism, rather than resolving conflicts through peaceful resolution and compromise...but there you are, capitalism in all its forms is aggressive and self-serving, and mutual help and co-operation tend to take a back seat...especially when it comes to arms sales, making a profit at others expense and "pulling more than one's weight" is more important than trading and negotiating as equals.
The United Nations, which was set up by the winning powers after the 2nd world war, to prevent such events and horrors occuring again, such as fascism in Germany, by providing an international forum for conflict resolution, seems unable or inept at preventing such recurrences in todays world. Drones are another example, where there is no legal jurisdiction or reasoning given over who or what is attacked by those who own, manage and deploy them.