Relations between Poland and Ukraine have deteriorated massively. It’s a problem for the whole of the EU; Kyiv’s closest partners need to pay more attention.

With its opposition to taking cheap loans from the EU’s SAFE defense fund, the nationalist-populist Law and Justice (PiS) party has decided to make Poland’s attitude to the EU the country’s key political cleavage. This is unprecedented and dangerous.

It will not be possible to secure Ukraine without the EU changing its approach to enlargement.

Despite good intentions, ties between Warsaw and Berlin have remained frosty. The European rearmament effort offers an opportunity to improve the relationship that must not be missed.