The US president says Asia's security must not be based on
intimidation of small nations by big ones.
Barack Obama told students in Brisbane, Australia - where he
is attending the G20 summit - that security in the region must depend on
He said there was "no question" over his commitment to
Asia-Pacific allies, referring to US efforts to strengthen strategic
ties with the region.
The two-day G20 summit will focus on promoting economic growth.
World leaders are expected to expand on plans agreed by G20
finance ministers in February to boost global growth by 2% in five
UN Secretary General Ban Ki-moon also urged those attending
to meet the challenges posed by Ebola, climate change and the conflict