The Russian military and security forces stopped what could have become a "civil war," President Vladimir Putin said on Tuesday.

"The Russian military in a difficult hour for the country stood in the way of turmoil, the result of which would be chaos," Putin said at an event for military units, adding that "the military and law enforcement officers of the Russian Federation actually stopped the civil war."

Defense Minister Shoigu, who the Wagner Group leader Yevgeny Prigozhin's had sought to have replaced, was present at Tuesday's ceremony.

-ABC News' Tanya Stukalova

The Russian Federal Security Service on Tuesday dropped the criminal case investigating the rebellion by Wagner Group leader Yevgeny Prigozhin and his forces.

The FSB said it closed the case because it has been established that participants stopped actions directly aimed at committing a crime.

-ABC News’ Anastasia Bagaeva

The military in Belarus was ordered to "full combat readiness" during the Wagner Group's rebellion in neighboring Russia, President Alexander Lukashenko said.

Lukashenko, a longtime ally of Russian President Vladimir Putin, was said to have helped broker a deal to halt the choatic rebellion by Wagner leader Yevgeny Prigozhin.

"I will not hide, it was painful to watch the events that took place in the south of Russia," Lukashenko said Tuesday during brief remarks before a military presentation. "Not only me. Many of our citizens took them to heart. Because the fatherland is one."

The fatherland comment appeared to allude to Lukashenko's longstanding belief that Russia and Belarus share a special bond.

He added, "I gave all orders to bring the army to full combat readiness."

-ABC News' Victoria Beaule

The U.S. will announce another military aid package for Ukraine Tuesday, a U.S. official told ABC News.

The $500 million aid package will include 30 Bradley Infantry Fighting Vehicles, 25 Stryker armored vehicles, missiles for the HIMARS system and the Patriot air defense system, TOW missiles, Javelins and more ammunition for artillery, according to the official.

This will be the 41st aid package under the Presidential Drawdown Authority that allows the transfer of weapons from U.S. military stockpiles to Ukraine.

-ABC News' Luis Martinez

U.S. President Joe Biden will make a "memorable speech" before world leaders in Lithuania's capital on the final day of a high-stakes NATO summit, according to National Security Council Senior Director for Europe Amanda Sloat.

Biden's remarks on Wednesday afternoon will focus on similar themes to what he said during his speech in Poland in late February marking one year since Russia waged war on Ukraine.

"President Biden will talk about the strength of the NATO Alliance and how it remains a force for global security and stability, as it has for more than seven decades. He'll talk about how NATO is more vital to our shared future and that didn't happen by accident," Sloat told reporters during a press briefing in Vilnius on Wednesday morning.

"As the president has talked about before, Vladimir Putin thought he could break our resolve when he invaded Ukraine. But our NATO allies and our partners around the world responded by coming together to support the brave people of Ukraine as they defend their freedom, their independence and their democracy," she added.

Beyond addressing the strength of the NATO alliance and the importance of standing by Ukraine, Biden will also look to pitch cooperation like we've seen for Ukraine to tackle other major challenges facing the world, "including the climate crisis, emerging technologies, upholding the international rules of the road and expanding opportunities so we build an economy where no one gets left behind," according to Sloat.

-ABC News' Molly Nagle