Is the war entering a new phase? A multi-storey apartment has been hit with what Russian-installed authorities called a Ukrainian drone strike in the Donetsk region. The area is in a Russian-controlled part of Ukraine. European heatwave, scorching weather triggers UK'red' warning Rubio: US'completely aligned' with Gulf allies on Iran

The AI arms race between China and the US has researchers on both sides worried about a "Chernobyl moment." Just over a week ago, I attended a major artificial intelligence conference in Zhongguancun, Beijing's bustling high-tech district. It was packed with fascinating sessions touching on everything from recursive self-improvement--the idea that models can tweak their own code and advance indefinitely--to humanoid robots. And it featured a few legends of computing, including Whitfield Diffie, co-inventor of public-key cryptography, and Andrew Barto, who won the Turing Award with Rich Sutton for his pioneering work on reinforcement learning. But I left with one takeaway above all else: The US and China should put their fierce AI rivalry to the side.

Is the war entering a new phase? Ukrainian strikes on Russian-occupied Crimea have triggered power outages in its largest city, Sevastopol, according to statements from both sides, as Kyiv intensifies attacks on the peninsula Moscow annexed in 2014. Crimea has been forced to suspend fuel sales to the public as Ukraine's army targets Russian logistics to the region and has hit a series of oil refineries and depots across southern Russia that provide supplies. "The enemy is once again striking treacherously, attempting to deprive us of normal living conditions and sow panic," he posted. He said some areas of the city - where temperatures are approaching 30 degrees Celsius (86 degrees Fahrenheit) - would be without power until at least Wednesday evening.

Is the war entering a new phase? Gas sales in Russian-controlled Crimea have halted after Ukrainian drone strikes on the peninsula's supply route. Drivers are now looking for other modes of transport. Colombia's De La Espriella claims victory on preliminary results US and Iran meet for'tense' but'constructive' ceasefire talks What are the end goals of Iran-US negotiations?

Machine learning models now influence decisions that directly affect people's lives, making it important to understand not only their predictions, but also how individuals could act to obtain better results. Algorithmic recourse provides actionable input modifications to achieve more favorable outcomes, typically relying on counterfactual explanations to suggest such changes. However, when the Rashomon set - the set of near-optimal models - is large, standard counterfactual explanations can become unreliable, as a recourse action valid for one model may fail under another. We introduce ElliCE, a novel framework for robust algorithmic recourse that optimizes counterfactuals over an ellipsoidal approximation of the Rashomon set. The resulting explanations are provably valid over this ellipsoid, with theoretical guarantees on uniqueness, stability, and alignment with key feature directions. Empirically, ElliCE generates counterfactuals that are not only more robust but also more flexible, adapting to user-specified feature constraints while being substantially faster than existing baselines. This provides a principled and practical solution for reliable recourse under model uncertainty, ensuring stable recommendations for users even as models evolve.

Russian troop build-up threatens city seen as key to seizing Ukraine's Donbas Russian troops have infiltrated the strategic city of Kostyantynivka in eastern Ukraine and are now trying to surround it. The entire city is now effectively in a grey zone, no longer controlled by anyone, Ukrainian soldiers have told the BBC. They get into areas behind our backs and in urban conditions it's extremely difficult to push them out, says a Ukrainian drone pilot who operates in that area and prefers to remain anonymous. Kostyantynivka is a gateway to the rest of the Donbas region. If it falls, Russian forces would be able push towards Ukraine's last remaining strongholds in the east, the cities of Kramatorsk and Sloviansk, and move closer to seizing Donbas completely, one of the Kremlin's key objectives in this war.

Is the war entering a new phase? Russian forces have attacked the Ukrainian city of Zaporizhzhia with glide bombs, killing five people, Regional Governor Ivan Fedorov said. In a post on Telegram on Saturday, Fedorov said that Russian air strikes had injured 11 people, and the number was rising after the attack destroyed and damaged residential and non-residential buildings. In recent weeks, Russia and Ukraine have escalated attacks as talks to end the conflict remain at a standstill. On Saturday morning, an aerial attack killed one person and wounded nine others in the city of Kharkiv in eastern Ukraine.

Ukraine President Volodymyr Zelensky says he has returned Poland's highest honour after his Polish counterpart Karol Nawrocki said he was stripping him of the award. The Polish Order of the White Eagle was bestowed on Zelensky in 2023 by then-President Andrzej Duda. But Kyiv caused outrage last month after renaming a Ukrainian army unit after a group of controversial World War Two fighters called the Ukrainian Insurgent Army (UPA). Three senior Ukrainian officials have also said they are returning awards bestowed by Poland, to show solidarity with their president. Many in Ukraine regard the UPA, which existed in the 1940s and 1950s, as heroes who fought for Ukrainian independence against the Soviet Red Army, Nazi Germany and Polish authorities.

Ukraine's Volodymyr Zelensky has been stripped of Poland's highest state honour, the Order of the White Eagle, over Kyiv's decision to name a military unit after controversial World War Two fighters. Polish President Karol Nawrocki branded Ukraine's decision late last month to name the unit after the Ukrainian Insurgent Army (UPA) outrageous, incomprehensible and deeply disappointing. Nawrocki stressed the diplomatic row would not impact Poland's support for Ukraine against Russia. Ukraine's Foreign Minister Andrii Sybiha denounced Warsaw's move, calling it a strategic mistake and disrespectful. Many in Ukraine regard the UPA, which existed in the 1940s and 1950s, as heroes who fought for Ukrainian independence against the Soviet Red Army as well as Nazi Germany and Polish authorities.

Is the war entering a new phase? Russia has renewed its strikes on Ukraine, killing three people including an eight-year-old girl, Ukrainian officials said. The Russian strikes on Friday come a day after Ukraine launched its biggest-ever drone attack on Moscow, killing a different eight-year-old girl and sparking an inferno at a major oil refinery, according to Russian officials. Between late Thursday and early Friday, Russia launched 90 drones at Ukraine, according to the Ukrainian air force. "An eight-year-old girl was killed. These are the consequences of this morning's enemy attack on Pavlohrad," Oleksandr Ganzha, the governor of Ukraine's central Dnipropetrovsk region, said.