Ukraine launched one of its deepest drone strikes inside Russia overnight, targeting energy and military facilities in St Petersburg just as the city prepared to host President Vladimir Putin's flagship economic forum.
Meanwhile, Russian authorities accused Ukraine of carrying out a separate drone strike on a passenger bus in the Russian-controlled part of the Donetsk region, which killed 8 and injured many.
The attacks came hours after a deadly wave of Russian missile and drone strikes on Ukrainian cities, reflecting the intensifying tit-for-tat campaign that has pushed the war deeper into both countries' territory.
According to news agency AP, Ukrainian long-range drones struck an oil terminal and military facilities in St Petersburg, Russia's second-largest city, forcing temporary airport closures and disrupting communications ahead of the annual St Petersburg International Economic Forum (SPIEF).
Ukrainian President Volodymyr Zelenskyy said the drones flew more than 1,000 kilometres to hit the St Petersburg Oil Terminal.