Good evening everyone, I'm Allison Kamerata, welcome to CNN tonight.

We have breaking news on a chaotic situation in Russia.

There are reports of military vehicles on the streets in Moscow right now.

The Russian military is accusing the head of the mercenary Bogner group, the Evgeny Progozhian,

of calling for an armed coup in Russia.

Progozhian is vowing violent retaliation for what he says was a deadly attack by Russian

forces that killed a huge amount of his mercenaries.

President Biden has been briefed on this situation.

We're told national security officials at the White House are closely watching developments

and not weighing in until they have a clearer sense of what exactly is happening.

Let's go right now to CNN, senior international correspondent Matthew Chantz in Kiev.

Matthew.

Well, Allison tensions between Evgeny Progozhian and the Russian defense ministry are finally

coming to a head.

With a Wagner leader threatening to attack Russian troops, in retaliation for what he says

was a deadly strike against his own paramilitary forces.

In extraordinary developments tonight, the Russian security services are accusing Progozhian

of starting a coup attempt and have launched a criminal prosecution against him that could

eventually see him jailed in what would be a dramatic fall from grace of one of the

country's most prominent and outspoken figures for months.

Progozhian has been lambasting Russia's high command for its handling of the Ukraine

war.

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