Russia is facing a major military crisis as the former state ally Yevgeny Prigozhin declared war on Moscow's defense ministry amid a feud with top military leadership.

What Happened: Prigozhin has vowed revenge against the Kremlin, whose officials he alleged had killed thousands of his private mercenaries, reported Reuters.

"If anyone gets in our way, we will destroy everything!" Prigozhin said, adding he had pulled his troops back from Ukraine.