Three million refugees have already departed Ukraine, the vast majority of them have gone to Poland

In less than three weeks, Russia's invasion of Ukraine has evacuated 3 million people to neighbouring countries, with millions more internally displaced, in what has fast become Europe's biggest migration crisis since World War II.

While the majority of refugees have been welcomed generously by host nations rejecting President Vladimir Putin's indiscriminate onslaught, the rapid inflow of migrants is having a dramatic inf....