Image caption, Zelensky's plane after it landed in Norway after flying in from Moldova A plane carrying Ukrainian President Volodymyr Zelensky was delayed by a Russian drone as he prepared to fly to attend a state funeral in Oslo, Moldovan and Norwegian authorities say. Zelensky and his wife Olena were on the jet at Chisinau, Moldova's capital, ahead of Wednesday's funeral of Norway's King Harald V when the unmanned aircraft crossed over the Moldovan border. The drone prompted an immediate airspace shutdown and Zelensky's plane was left on the runway for around an hour before it could take off. The flight was only authorised after it was confirmed the drone had come down 160km (100 miles) away. Asked by reporters on Thursday, the Kremlin said there had been no threat to the jet. Zelensky's plane had been due to take off at around 16:30 (14:30 GMT) from Chisinau International Airport.

Is the war entering a new phase? Ukraine launched its deepest-ever attack into Russia, targeting two Arctic gas condensate facilities more than 3,000km (1,865 miles) from its border, on Wednesday, signalling that Ukraine has further developed its military capabilities as the Russia-Ukraine war continues through its fifth year. Unconfirmed videos circulating on social media show large clouds of thick, dark smoke and fire at the Novy Urengoy plant in western Siberia, recorded from a distance. Dmitry Artyukhov, the governor of the Yamalo-Nenets Autonomous Okrug region, wrote on Telegram that the drone attacks had been intercepted and "debris from the drone caused a fire upon impact". There have been no reports of deaths or injuries.

Russia fired its new rapid, jet-powered drones against Ukraine every day throughout August, BBC Verify analysis of Ukrainian Air Force data has found, escalating its use of a weapon that Kyiv's air defences are struggling to deal with. It marked the first time that daily attacks by Moscow's new upgraded Geran drones were recorded in Ukrainian Air Force data. The growing use of jet-propelled and other varieties of drones prompted President Volodymyr Zelensky to condemn what he called an unfolding horror over the skies of Kyiv. Ukraine's military recently told the BBC that jet-powered drone attacks grew from 350 in June to 1,600 in July and 2,800 in August. In five of the nightly attacks in August, these drones outnumbered the older, slower models.

Volodymyr Zelenskyy's plane was almost hit by a Russian drone while departing Moldova for Norway, according to Norway's prime minister. Two drones forced Chisinau airspace closure.

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Taken from high resolution satellite imagery. Can you tell us a bit about your background and your current area of research? I use computational tools to study animal behaviour. After my PhD, I joined the U.S. Army Research Office, where I used satellite imagery to follow animals across whole landscapes, which is a powerful technique for seeing broad patterns, but far too coarse to capture what individuals are actually doing. That gap is what drives my current work at Princeton: I combine drone video with AI methods to resolve movement at much finer scales, as I have done in studies of Olive Baboons and lions.

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To play this video you need to enable JavaScript in your browser. Kyiv is suffering more daily air raid alerts than at any time since Russia's full-scale invasion in 2022, according to BBC Verify analysis of government figures. Most air attacks used to come at night but Russia's new tactic of striking Ukraine's capital during the day is causing huge disruption to schools and businesses. The round the clock attacks have forced people to head for shelter as many as 13 times a day, with air raid alerts lasting from a few minutes to nearly four and a half hours. Residents in Kyiv are struggling to adapt to this new reality, adding to existing stress and anxiety.

A Russian drone has hit the headquarters of the Security Service of Ukraine (SBU) during a strike in the heart of Kyiv, Ukrainian President Volodymyr Zelensky has said. The unmanned aerial vehicle crashed into the SBU headquarters on Friday afternoon, targeting a room used by security chief Oleksandr Poklad. It is not clear whether Poklad was in the building, but Zelensky said he had since spoken to him to order an appropriate, tangible response. The drone was aimed directly at the office of the Head of the Security Service in that building, Zelensky confirmed. It suggests Russia's new drones are growing in accuracy and signals Moscow could step up strikes before possible US mediation talks this weekend.