Finland could face mass cyber attacks and even a Russian invasion if it tries to join NATO, the country’s president has warned.

President Sauli Niinisto said Moscow would send a ‘robust’ military force into the country and ‘destabilise Finnish society’ through cyber hacks should Helsinki ask to enter the Western military alliance.

Niinisto added: ‘We don’t even know all the possibilities for hybrid influencing that someone may invent. The entire world of information technology is vulnerable.

‘Even some important society functions can be disrupted.’