Canadian historian Margaret MacMillan writing in The Globe and Mail:

The horrors of the Second World War still live on in our memories but that devastated world has long since been rebuilt, and many of us . . . have lived in a world where major state-to-state wars have come to seem impossible. And we have taken for granted that our international institutions, tattered though they may be, allow that countries of the world can sort out their differences; more, that there is something called an international community that can still work together. Vladimir Putin’s war on Ukraine – and let us make no mistake, it is his and no one else’s – has suddenly brought the past very close and made the future very uncertain.