The attack on Friday, which killed at least four people nationwide, came two days after Russia vowed retaliation for an audacious drone assault on its strategic bomber bases.

Russia has launched a massive missile and drone attack on Ukraine's capital Kyiv, killing at least 6 people and injuring over 80. This attack comes in retaliation to Ukraine's recent drone strikes on Russian military bases.

Officials say Ukraine was under an ongoing Russian ballistic missile and drone attack early Friday that wounded at least three people.