World News Update, what you need to know

Lawyers for Andrew Chan and Myuran Sukumaran will return to court on Thursday with their most urgent appeal yet, as the Australians on Indonesia's execution island wait for a breakthrough.

ELSEWHERE

EGLIN AIR FORCE BASE, Florida - Human remains and helicopter parts have been recovered after seven Marines and four soldiers crashed in heavy fog during military training in Florida.

VILLA CASTELLI, Argentina - A team of French investigators has arrived in Argentina to probe a twin helicopter crash that killed 10 people during a reality TV shoot, including three of France's best-known sports stars.

MOSCOW - A former Chechen police officer who admitted taking part in the murder of Russian opposition activist Boris Nemtsov "likely confessed under torture", a member of the Kremlin's human rights council says.

LONDON - Jeremy Clarkson, the controversial presenter of hit BBC program Top Gear, has joked about his suspension as an online petition for him to be reinstated gathered over half a million signatures.

LONDON - The police chief at the 1989 Hillsborough stadium disaster has apologised to the families of the 96 Liverpool supporters killed, saying he regrets lying about how the tragedy unfolded.

WASHINGTON - The IMF has handed Ukraine a $US17.5 billion ($A22.97 billion) lifeline as the United States agreed to send military aid to bolster its forces against pro-Russian rebels - but stopped short of promising weapons.

LONDON, March 11 AAP - Britain is to follow Australia's lead and introduce plain packaging in mid-2016 with public health advocates suggesting the majority of Europe could likewise ban tobacco branding within five years.