What has been happening in Ukraine is not a wake-up call precisely but a tugging at the attention, a demand to focus.
There's a sense that in some new way we are watching the 21st century take its shape and express its central realities. Exactly 100 years ago, in August 1914, the facts that would shape the 20th century gathered and emerged in the Great War. History doesn't repeat itself; you can't, as they say, step into the same stream twice. But it does have an unseen circularity.
....
A Mideast dictator last year used poison gas on his own population and strengthened his position. He's winning. What does that tell the other dictators? What does it suggest about our future?
Peggy Noonan: Warnings From the Ukraine Crisis - WSJ.com