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

Russia will take years to replace nuclear-capable bomber planes that were hit in Ukrainian drone strikes last weekend, according to Western military aviation experts, straining a modernisation programme that is already delayed.

Russia launched an intense missile and drone barrage at the Ukrainian capital in the early hours of Friday and three people were killed, Ukrainian officials said, as powerful explosions reverberated across the country.