But its government chose to ignore the warning.
Alexander Gillespie is a professor of international law at the University of Waikato, New Zealand. His research focuses on laws of war and armed confl... ict. He is the author of the three-volume set "A History of the Laws of War" and the three-volume set The Causes of War.
The 1987 treaty was not perfect, but President Trump is unlikely to secure a better deal that can make the world safer.
The proliferation of conventional weapons is out of control and incredibly deadly.
The freeze-for-freeze deal suggested by China and Russia can avert a deadly showdown between the US and North Korea.
Current defence systems in place might not be fully effective against a North Korea attack.
The US has made clear it has not declared war on North Korea. But Pyongyang can still trigger military confrontation.
What does a nuclear North Korea mean for the world?