BBC's Duncan Kennedy said Obama had a very close relationship with Australian prime minister Julia Gillard
US President Barack Obama has arrived in Australia for a visit expected to focus on strengthening military ties.
During an address to parliament on Thursday, he is due to outline plans for a greater US role in the region.
He will also become the first sitting US leader to visit Darwin, which is likely to see a boosted US military presence as part of a new agreement.
Analysts say the US sees Australia as a key regional ally and a counter to China's growing presence.
The visit comes as the two countries mark a 60-year security alliance.
Source from BBC
