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

The Ukrainian military has landed troops on the Russian-held eastern bank of the Dnipro River across from the city of Kherson, according to Russian reports.

Media posted online by pro-Russian accounts suggested small boatloads of Ukrainian soldiers have managed to establish a small beachhead at the foot of the destroyed Antonivskiy Road Bridge that spanned the river before Ukraine brought it down last year.

The size of the Ukrainian force on the bank is unclear, but Russian accounts suggested it was relatively small.

Some Russian accounts posted dramatic video showing fighting on the eastern bank, including what appears to be a Russian armored vehicle firing intensively at Ukrainian soldiers as it recovers Russian wounded.

The video was undated but Russian reports suggested around several dozen Ukrainian troops landed on June 24 and Russian airborne units have been trying to dislodge them since.

Another video shows a small boat carrying perhaps a dozen Ukrainian soldiers landing by the ruined bridge, coming under shell fire.

The Russian military blogger account, Two Majors, reported a small group of Ukrainian soldiers had succeeded in digging in around the bridge. It noted Russian forces had been forced to pull back to a distance from the bank because their positions had been flooded after the Kakhovka dam was blown up earlier this month.

Russian military bloggers said Russian aircraft and artillery were firing on the Ukrainians Monday.

If Ukraine is able to keep hold of its foothold, it will put further pressure on Russia’s forces in the south, already battling to hold back Ukraine’s counteroffensive on the Zaporizhzhia front.

-ABC News' Patrick Reevell