Victorian Opposition leader Matthew Guy has been caught lying about cooperating with a donation fraud investigation and referred to the state’s corruption regulator.

NSW Premier Dominic Perrottet says he is proud of the state’s corruption watchdog which “has teeth”, while refusing to say if it's interviewed him over the ICAC scandal that felled Gladys Berejiklian.

Medibank hackers may be in Russia, as well as in "other countries", say police, as Optus goes silent on ransom claim.

The directors of Optus owner Singtel were given major pay rises just weeks before the telco suffered one of the biggest data breaches in Australia’s history.

NSW Premier Dominic Perrottet is refusing to stand by the legality of a $5.5 million grant he made following an “intervention” by Gladys Berejiklian and heavy lobbying by Daryl Maguire.

China’s military exercises on its border with India over the past two years were all “defensive” in nature, say intelligence sources.