Ukraine’s ‘secret weapons’: Inside the training camps for foreign fighters.

In Ukraine's David and Goliath battle against the brute force of Russia, the United States and European countries have been adamant they won't send troops into the war for fear of escalating it. But that's not to say there aren't foreign fighters, including a number of Australians, taking up arms alongside Ukrainian soldiers. In fact there are actually about 20 thousand of them either in training or already on the battlefield. Of course, it's an incredibly dangerous, potentially deadly undertaking, but as Nine News correspondent Mark Burrows reports, these soldiers, Ukraine's secret weapons, are giving Putin an almighty headache.