The Wagner Group, Russia’s unofficial mercenary group, has increased its presence in Ukraine from 1,000 to 20,000 people.

British officials have also reported an increase in Mr Putin’s reliance on these mercenaries to promote his cause in Ukraine.

Specialist in Russian foreign and security policy at the Australian National University Associate Professor Matthew Sussex told 6PR Mornings members of the group are often ex-criminals who carry out the most violent acts.

Click PLAY below to hear what Professor Sussex had to say

“They are soldiers for hire… they are prepared to do anything to get paid,” said Professor Sussex.

“They are certainly those who will go into certain situations which require maximum violence.” He continued.