Ukrainian President Volodymyr Zelenskiy has arrived in Estonia to attend a summit of Nordic and Baltic leaders, a visit that comes amid friction over Ukrainian drones straying into the region in recent months.
The drones have crashed into the chimney of a power plant in Estonia, hit empty fuel tanks in Latvia and been shot down by Romanian fighter jets stationed in Lithuania.
Ukrainian officials apologised, saying the drones had been aimed at military targets inside Russia but were sent off course by Russian electronic interference.
