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.<br /><br />What Happened: Prigozhin has vowed revenge against the Kremlin, whose officials he alleged had killed thousands of his private mercenaries, reported Reuters.<br /><br />"If anyone gets in our way, we will destroy everything!" Prigozhin said, adding he had pulled his troops back from Ukraine.