Senior congressional leaders were briefed about the ongoing situation in Russia, according to a congressional aide.

U.S. intelligence officials told the so-called "Gang of Eight" -- the top Republicans and Democrats currently in congressional leadership-- in recent days about potentially concerning movements of Wagner Group forces and equipment build-ups near Russia. However, it was unclear to U.S. intelligence what was going to happen and when.

-ABC News' Trish Turner

A senior U.S. official says it is a mystery as to why Yevgeny Prigozhin stopped his march to Moscow given that he was seemingly in a dominant position.

The official said he was greeted as a hero in Rostov-on-Don. However, the senior official told ABC News that Prigozhin is in an "emotional state," and perhaps did it because he thought this would destroy Russia, or because he glimpsed his own end. It is impossible to tell whether Prigozhin thinks Russian President Vladimir Putin will actually honor their deal which included allowing Wagner group soldiers to be folded into the Russian military.

The official said that Belarus President Alexander Lukashenko was very effective, telling Prigozhin and Putin that this was all a misunderstanding and that they are both patriots and aligned for the same goals.

Putin is said to be completely shocked by how fast Wagner Group moved through Russia. For now, he is just trying to secure his position. He does not want to be seen negotiating over his defense minister, but the official says the U.S. believes concessions were made over Sergei Shoigu's future as well as others.

-ABC News' Martha Raddatz

Secretary of State Antony Blinken spoke Saturday with Turkish Foreign Minister Hakan Fidan to discuss the ongoing situation in Russia.

"Secretary Blinken reiterated that U.S. support for Ukraine will not change. The United States will stay in close coordination with Allies and partners as the situation develops," spokesperson Matthew Miller said.

Blinken also spoke with Ukrainian Foreign Minister Dmytro Kuleba on Saturday to discuss the situation in Russia, Miller said. Blinken reiterated that support by the U.S. for Ukraine will not change.

The U.S. will stay in close coordination with Ukraine as the situation develops.

-ABC News Shannon K. Crawford

Yevgeny Prigozhin will go to Belarus to ease tensions and the fighters of PMC Wagner Group who took part in the so-called "campaign" against Moscow will not be prosecuted, the Kremlin said Saturday evening.

The rest will be able to sign a contract with the Ministry of Defense, the President of the Russian Federation Dmitry Peskov told reporters.

"In the end, we managed to resolve this situation without further losses, without raising the level of tension," Peskov said.

"An agreement was reached that PMC Wagner would return to their camps," he added.

Russian President Vladimir Putin offered his first public remarks after the Wagner Group attempted to march to Moscow and overthrow the government.

In a pre-recorded video statement, Putin thanked the Russians for their endurance, solidarity and patriotism during the ordeal and claimed that any blackmail attempt was doomed to fail.

Putin said an armed rebellion would have been suppressed.

"The organizers of the rebellion, betraying their country, their people, betrayed those who were drawn into the crime. They lied to them, pushed them to death, under fire, to shoot at their own," Putin said.

The Russian president noted that the majority of Wagner fighters were "patriots."

"I thank those soldiers and commanders of the Wagner Group who made the only right decision," Putin said. "They did not go to fratricidal bloodshed, they stopped at the last line."

Putin offered Wagner Group members who participated in the rebellion the option of joining the defense ministry or other law enforcement agencies or returning home.

-ABC News' Ellie Kaufman, Natalia Shumskaia, Tanya Stukalova and Anastasia Bagaeva