Chinese bombers will be able to strike Australia from new artificial islands in the South China Sea as part of a major military modernisation that has also prompted calls for Australia to develop a ballistic missile shield.

Chinese H-6K long-range bombers can more easily target bases in the Northern Territory and even installations such as Pine Gap and Harold E. Holt naval communications station outside Exmouth by flying from 3000-metre runways being built in the Spratly Islands, senior analysts warn.

Fears will be heightened further after Chinese air force chief Ma Xiaotian​ announced on Friday China is developing a long-range bomber that will improve its ability to strike far from home.

Former national security adviser Andrew Shearer said China's rapidly improving ballistic missiles bolstered the case for Australia to "get much more serious" about missile defence, including a land-based shield similar to US Patriot missiles or the high-altitude systems being used by Japan and South Korea.

...

"The strategic purpose of the ADF for the future will be to protect Australia as a base for long-range allied operations," Dr Fruehling said.

Alan Dupont, chief executive of the security consultancy the Cognoscenti Group, said: "We are a redoubt or a sanctuary if you like for the US. China's strategy, I have no doubt, is to prevent any increased use of Australian facilities by the US."

Dr Davis agreed: "China is not going to permit this without responding."

Former Defence official and now head of Strategy International, Ross Babbage, said the US had limited basing options in Asia. "As a consequence, the Chinese know damned well they can target these facilities and do a lot of damage in the early hours of a clash. That could include, and many people think would include, some places in Australia."

The Abbott government pushed for Washington to request that Australia expand its air strikes against the Islamic State terror group from Iraq to its more dangerous neighbour Syria, Fairfax Media has learnt.

Government sources say it was Mr Obama who raised Syria as a topic and then made the first suggestion of Australia's expanded role.

But it is widely known in government circles that Mr Abbott has long been keen to do more in the fight against the Islamic State, which has taken swaths of territory stretching across Syria and Iraq and established affiliates in Libya, Egypt and Saudi Arabia.

from humanitarian air drops to begging master to let us off the leash, in 12 months.

As a parade of senior Australian and United States commanders and their public affairs teams attempted to stay on message about the “humanitarian” aspects of the biggest military exercise ever in Australia — the shadow of China was cast over every facet of the intensive war gaming.

During a lightning visit to the exercise area on Sunday, Prime Minister Tony Abbott insisted that China appreciated that Australia was an ally of the United States.

Mr Abbott further confused things when he declined to rule out the possible future permanent basing of USA forces in Northern Australia.

The Marine Corps training rotation is scheduled to grow from 1100 now to 2200 in the next few years, but Mr Abbott left the door open for even greater access for USA forces to the deserted and wide-open training ranges of Northern Australia.

When asked specifically if there would be USA forces based in the north the prime minister was noncommittal.

“Let’s see what the future holds. I am not saying there will be more … but they shouldn’t shock or surprise anyone.”

Ask any of the thousands of USA Marines participating in Talisman Sabre — particularly those based on the tiny island of Okinawa in Japan — and they will tell you that the NT and Rockhampton are war games nirvana.

A man is cut out of a ute after it crashes with a USA Marines vehicle in Katherine in the NT.

Police said the crash happened at 1:45pm at the junction of the Victoria and Stuart highways.

The 34-year-old man was trapped in the ute for about 45 minutes while emergency services diverted traffic and attempted to free him from the wreckage.

Police told the ABC the man has been taken to Katherine Hospital with non-life-threatening injuries.

The six-wheel off-road truck is called a Medium Tactical Vehicle Replacement - a vehicle used by the USA Marines to haul equipment and troops.

AUSTRALIAN and American environmental specialists were cleaning up a suspected fuel spill at a popular Darwin beach on Wednesday.

The ADF and Marines were notified of a marine fuel spill on Casuarina Beach, off Lee Point on Tuesday.

Results of sand quality testing revealed an area about 20m long and 10m wide that may have been contaminated in a spill which occurred during an amphibious offload as a part of Exercise Talisman Sabre — Australia’s largest combined military exercise, which runs through until July 21.

A spokesman said the ADF had “notified all appropriate government agencies”.

“The ADF’s environmental team took immediate steps to cordon the area and began to assess the extent of the incident,” he said.

It’s not known what caused the spill.

"It’s not known what caused the spill" - you don't think it might have been that big old Landing Craft that kept coming up onto the sand?