(NEW YORK) -- As Russia continues its nearly 16-month-long invasion of neighboring Ukraine, political turmoil has erupted in Moscow while Kyiv tries to take back territory.
A feud between Yevgeny Prigozhin, head of the Russian paramilitary organization Wagner Group, and Russia's top military brass escalated as Prigozhin's forces left the front line in Ukraine and marched across the border to seize a key Russian city. They then marched north toward Russia's capital, seemingly unopposed, before turning around just hours later. The short-lived rebellion was described by international observers as the most significant challenge to Russian President Vladimir Putin's authority in his more than 20 years of rule.
Meanwhile, Ukrainian troops are in the early stages of a counteroffensive to reclaim the almost one-fifth of Ukraine’s territory that is under Russian control.
Here's how the news is developing. All times Eastern:
Aug 25, 12:08 PM EDT
Ukraine carries out drone attack in Crimea
Ukraine conducted a massive drone attack in Crimea Thursday night into Friday morning, Ukraine Defense Intelligence spokesman Andrii Yusov told ABC News.
An attack was made on the Russian 126th Separate Guards Coastal Defense Brigade of the Black Sea Fleet in the village of Perevalne, Yusov said.
"We are still calculating enemy losses at the moment," Yusov said
-ABC News' Ellie Kaufman
Aug 25, 11:39 AM EDT
Bomb likely cause of explosion that downed Prigozhin's plane, US officials say
The explosion that downed a plane carrying Wagner Group leader Yevgeny Prigozhin and nine others in Russia was likely caused by a bomb, two U.S. officials told ABC News on Friday.
A senior U.S. official said the preliminary belief is that the private jet was downed Wednesday by an explosion on board, potentially caused by a well-placed bomb.
Another U.S official said the United States believes that a bomb was very likely the cause of the explosion.
-ABC News' Josh Margolin and Luis Martinez
Aug 25, 11:31 AM EDT
Putin had no recent meetings with Prigozhin, Kremlin says
Russian President Vladimir Putin had no recent meetings with Yevgeny Prigozhin, Kremlin spokesman Dmitry Peskov said Friday.
We don't know yet how long the investigation procedures will be," Peskov said when asked if Putin will attend Prigozhin's funeral.
"The president has a busy schedule in general," he added.
Peskov would not comment on the cause of the plane crash.
-ABC News' Anastasia Bagaeva and Ellie Kaufman
Aug 25, 8:17 AM EDT
Kremlin denies role in plane crash believed to have killed Prigozhin
Russia on Friday vehemently denied having any involvement in the mysterious plane crash that is believed to have killed Wagner Group leader Yevgeny Prigozhin.
"There has been a lot of speculation around this crash [and] the tragic deaths of the plane's passengers, among them Yevgeny Prigozhin. Of course, the West presents all this speculation from a particular angle. All of that is sheer lies," Kremlin spokesperson Dmitry Peskov told reporters while answering questions during a press briefing. "One should rely on facts. For now, there are not many facts, they have yet to be established in the ongoing investigative procedures."
Prigozhin, 62, was a former close ally of Russian President Vladimir Putin. His private paramilitary organization played a key role in Putin's invasion of neighboring Ukraine before briefly launching an insurrection against the Russian military in June. Forces loyal to Prigozhin marched toward Moscow before turning back after several days.
A private jet was en route from Moscow to St. Petersburg on Wednesday when it went down near the village of Kuzhenkino in Russia's Tver region, north of Moscow. All 10 people on board were killed. Prigozhin and Wagner Group co-founder Dmitry Utkin were among the passengers identified on a flight list, according to Russian officials.
The U.S. Department of Defense said Thursday that Prigozhin was "likely" killed in the plane crash.
Jul 25, 1:00 PM EDT
Pentagon announces new $400M aid to Ukraine
The U.S. Department of Defense announced an additional $400 million aid package to Ukrainian forces that includes more weapons and ammunition.
This marks the Biden administration's 43rd military aid package to Ukraine since August 2021.
Some of the equipment and weapons in this package include, additional munitions for Patriot air defense systems and National Advanced Surface-to-Air Missile Systems (NASAMS); Stinger anti-aircraft systems and Javelin and other anti-armor systems and rockets.
-ABC News' Matthew Seyler
Jul 20, 4:04 PM EDT
Ukraine begins using controversial cluster munitions provided by US
Ukraine has begun using the controversial cluster munitions that the U.S. recently began providing to Ukraine, a U.S. official confirmed to ABC News.
Ukraine, Russia and the U.S. are not signatories to the convention that bans the use of cluster munitions. Russia has used them in the war in Ukraine and so has Ukraine as they a supply of the weapons left over from the Soviet era.
"I believe they have started using them," Pentagon deputy press secretary Sabrina Singh said Thursday. "In terms of the effect on the battlefield, I'd really let Ukraine speak to how they intend to employ them. But you know, this is a powerful artillery that we have given them. They have ... committed to use it responsibly, to keep track and record where they are using it, so when this war is over, they can begin those de-mining efforts."
The weapons are considered dangerous to civilians because the small bomblets that are dispersed by the munitions can remain unexploded until someone accidentally stumbles upon them weeks, months or even years later.
-ABC News' Luis Martinez
Jul 19, 9:47 PM EDT
Russian strikes hit Mykolaiv and Odesa, multiple people injured
Russian forces hit a three-story building and a garage in the city center of Mykolaiv Thursday morning, local time, injuring nine people, including five children, the Mykolaiv Regional State Administration said on Telegram.
There were fatalities stemming from the strikes, but it's unclear how many at this time, the Mykolaiv Regional State Administration added.
In another incident, Russian strikes hit Odesa early Thursday morning, the Odesa District Administration said on Telegram.
Two people were injured and hospitalized from the attack, according to the Odesa District Administration.
There is destruction "in the center" of Odesa and a fire broke out stemming from the strikes, the administration said.
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