"The situation in Belgorod continues to be tense. There were two attacks in the morning," the governor of the Belgorod region Vyacheslav Gladkov said.

Russian air defence said it destroyed six missiles over the Belgorod region, which has been repeatedly struck throughout the conflict.

One person was killed and eleven injured the day before, Gladkov said.

An aerial attack damaged infrastructures and caused power cuts in the Kursk region, to the north of Belgorod, its governor Roman Starovoyt said on Telegram.

And another missile was downed near Sevastopol in the Crimean peninsula that Russia annexed in 2014, the city's governor said, with no reported damage.

Russian regions bordering Ukraine have seen regular strikes since the beginning of the offensive.

But Belgorod has been particularly hit in the wake of massive Russian strikes on Ukraine last week.

On Friday, a massive bombardment across Ukrainian cities, including Kyiv, killed over 30 people.

In retaliation Belgorod faced a wave of attacks over the weekend, with 25 people killed -- an unprecedented toll since the beginning of the offensive almost two years ago.

Russia then launched 99 missiles over Ukraine on Tuesday morning, Kyiv said, with five dead.