Over the past couple of days two bellicose 

countries have breached the borders of 

countries with which they are not at war. 

The incursions are not similar, but in both 

cases the consequences are serious. 

At least 19 Russian drones violated Poland’s 

airspace, bringing the NATO country closer 

to open conflict than at any time since the 

 second world war, its prime minister said. 

How the alliance now responds is crucial, 

  as we explain.