Fox News Flash top headlines are here. Check out what's clicking on Foxnews.com. Ukraine told critics of the pace of its three-month-old counteroffensive to "shut up" on Thursday, the sharpest signal yet of Kyiv's frustration at leaks from Western officials that say its forces are advancing too slowly. Nearly three months since launching a much vaunted counteroffensive using hundreds of billions of dollars of Western military equipment, Ukraine has recaptured more than a dozen villages but has yet to penetrate Russia's main defences. Stories in the New York Times, Washington Post and other news organisations last week quoted U.S. and other Western officials as suggesting the offensive was falling short of expectations.

The leader of the United Kingdom's Secret Intelligence Service, commonly known as MI6, gave a rare speech in Prague Wednesday during which he encouraged Russians opposed to the war in Ukraine to spy for the British, telling any defectors from the Kremlin, "Our door is always open." "There are many Russians today who are silently appalled by the sight of their armed forces pulverizing Ukrainian cities, expelling innocent families from their homes and kidnapping thousands of children," MI6 chief Richard Moore said from the British embassy in Prague, according to The Telegraph. "They are watching in horror as their soldiers ravage a kindred country. They know in their hearts that Putin's case for attacking a fellow Slavic nation is fraudulent, a miasma of lies and fantasy." Moore stated that "many Russians are wrestling with the same dilemmas and the same tugs of conscience" as those a generation ago did in 1968 when Soviet tanks crushed the Prague spring uprisings. "I invite them to do what others have already done this past 18 months and join hands with us. Our door is always open," the U.K. Secret Intelligence Service chief said.

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The head of Russia's Wagner mercenary force has again criticised the Russian military and political elite following the drone attack on Moscow that injured two people, damaged property and left some furious the Kremlin had not better protected the capital city. In an expletive-drenched statement posted on Telegram by his press service on Tuesday, Yevgeny Prigozhin – whose mercenary fighters have played a key role in the war in Ukraine – blamed the drone attack on out-of-touch officials living in Moscow's affluent suburb of Rublyovka. "You, the Defence Ministry, have done nothing to launch an offensive," Prigozhin said in the statement. "How dare you allow the drones to reach Moscow?" "And what do ordinary people do when drones with explosives crash into their windows?" Focusing his ire on powerful residents of the upmarket Rublyovka area in Moscow's western suburbs, Prigozhin spoke of the "scum" and "swine" who sat quietly while Moscow was attacked.

In October last year, a Russian news site published a short video of Yevgeny Prigozhin, founder of the Wagner Group, the Russian mercenary army, sitting with four men on a rooftop terrace in the resort town of Gelendzhik, on Russia's Black Sea coast. Two are missing parts of a leg. A third lost an arm. They are identified as pardoned former convicts, returned from the front in Ukraine after joining Wagner from prison. "You were an offender, now you're a war hero," Prigozhin tells one man in the clip. It was the first video to depict the return of some of the thousands of convicts who joined Wagner in return for the promise of a pardon if they survived six months of the war. Reuters news agency used facial recognition software to examine this video and more than a dozen others and photographs of homecoming convict fighters, published between October 2022 and February 2023.

The U.S. is solidifying a defense package to Ukraine, which would help assist Ukraine with shooting down Russian drone strikes on civilian targets. North Korea is supplying arms to a Russian mercenary group and could continue to deliver military equipment to support the Kremlin's war against Ukraine, the Biden administration said Thursday. The White House said the weapons "will not change battlefield dynamics," however, the private entity receiving the equipment, Wagner Group, is committing atrocities and human rights abuses across Ukraine. "Because the Russian military is struggling in Ukraine, President [Vladimir] Putin has increasingly been turning to Wagner, which is owned by Yevgeny Prigozhin, for military support," White House National Security Council spokesman John Kirby said Thursday. Kirby said Prigozhin has been spending more than $100 million per month to fund Wagner's efforts inside Ukraine.