Recent Russian massive drone and missile attacks on Ukrainian energy system have caused more than $1 billion worth of damage to the sector, Ukraine's energy minister German Galushchenko said on Sunday.

"Today, we are talking about the amounts of losses for more than a billion dollars. But the attacks continue, and it is obvious that the losses will grow," Galushchenko said in a statement.

Galushchenko said the main damage was to thermal and hydro generation facilities, as well as power transmission systems.