Two missiles crossed Moldova, but Romania denies that its own airspace was violated.
Image source, ReutersUkraine has experienced more blackouts after cities and energy facilities were hit with fresh Russian attacks.
Ukraine’s air force said missiles and Iranian-made drones were used in a “massive attack” on Friday.
The Reuters news agency reported explosions in Kyiv, where officials urged residents to take shelter.
The latest attacks come a day after President Volodymyr Zelensky met EU leaders in his quest to receive fighter jets – following a visit to the UK.
Moscow has repeatedly targeted Ukraine’s energy facilities over the winter.
State-owned power company Ukrenergo said its infrastructure had been hit in eastern, western and southern regions, causing power cuts in some areas.