Across Europe, security forces are watching closely for a potential escalation in Russia's war - acts of arson and sabotage. This follows a series of suspicious fires and attacks on infrastructure in the Baltics, Germany, and the UK.

Arson, fires and attacks across Europe: Is Russia behind them?

In November, a group of hackers compromised the data of the health insurer Medibank and demanded a hefty ransom amount or else had threatened to sell the data of the firm's customers online.

Not paid ransom, hackers dump Australian health data on dark web, wish 'Happy Cyber Security Day'

Ukraine said on Tuesday it had thwarted an attempt by Russian hackers last week to damage its electricity grid with a cyberattack. "This is a military hacking team," said government spokesman Victor Zhora.

Ukraine says it thwarted Russian cyberattack on electricity grid