Amid heavy losses, Russia looks to next stage of Ukraine war

On Friday, a Russian drone hit an apartment building in Romania, a NATO member state.And earlier in the week, Russia pummelled Kyiv with drones and used a hypersonic missile - prompting condemnation from European leaders.Moscow has since threatened to launch more waves of attacks, warning foreigners and diplomats to leave. Sergey Radchenko, a Russian-born security expert who is writing a history of the Ukraine war, joined Nick Bryant to discuss Russia's heightened aggression.