The sad fact is that international politics has always been a ruthless and dangerous business, and it is likely to remain that way.

I believe that the existing power structures in Europe and Northeast Asia are not sustainable through 2020.

When World War II started on September 1, 1939, the German army contained 3.74 million soldiers and 103 divisions.

Offensive realism predicts that the United States will send its army across the Atlantic when there is a potential hegemon in Europe that the local great powers cannot contain by themselves.

In an ideal world, where there are only good states, power would be largely irrelevant.

The Soviet Union and its empire disappeared in large part because its smokestack economy could no longer keep up with the technological progress of the world's major economic powers.

The most dangerous states in the international system are continental powers with large armies.