Former servicemen and women who provide military training to foreign forces without government approval will face up to 20 years in jail in response to concerns Australian pilots are being headhunted to instruct Chinese aviators on flight tactics. Defence Minister Richard Marles will introduce legislation into parliament on Thursday beefing up existing laws designed to safeguard the nation’s military secrets. Australian citizen and former US Marine Daniel Duggan has been in custody since October accused of training Chinese pilots, but denies doing anything illegal. A new authorisation framework will be imposed, requiring ex-servicemen and women and Defence Department bureaucrats to…