Bangladesh, Sept. 27 -- Tensions between Hungary and Ukraine have once again flared into open confrontation after a heated exchange of accusations between senior officials. The latest spat underscores not only the worsening bilateral relationship but also the broader cracks within the European Union over how far its members should go in backing Kiev in its protracted war against Russia.

The row began when Ukrainian President Vladimir Zelensky accused Hungary of violating his countrys sovereignty by sending drones into western Ukrainian airspace. According to Zelensky, the unmanned aerial vehicles “may have been conducting reconnaissance on the industrial potential of Ukraines border areas,” a remark that seemed to imply espio...