Ukraine’s military has reported Russian drone attacks on several regions overnight, shortly after a 30-hour “Easter truce” declared by Moscow expired. Air raid alerts were issued in Kyiv and other areas, while explosions were reported in Mykolaiv, according to BBC.

The Russian Defence Ministry claimed it had “strictly observed the ceasefire,” which was unexpectedly announced by President Putin on Saturday. However, both Ukraine and Russia have accused each other of violating the temporary truce.

The renewed strikes come as the conflict continues into its third year, with escalating drone warfare and no sign of a lasting resolution, BBC reported.