U.S. President Obama opened his appearance at the G20 summit of world leaders in Australia with a speech that had to make Beijing think. He also took a shot at Russian President Vladimir Putin in his speech and later, after a Sunday meeting, Obama and the leaders of Japan and Australia made a point of criticizing Russia's annexation of Crimea and called for the prosecution of those responsible for the downing of Flight MH17 in eastern Ukraine. The United States is a big part of the power balance in Asia and plans to throw more of its weight onto the scale, the president told a crowd at the University of Queensland in Brisbane on Saturday. "We will continue to deepen our engagement using every element of American power -- diplomacy, military, economic, development, the power of our values and ideals," he said. And the United States will band together with nations in the region. It will work toward giving them more heft -- so that big nations do not "bully the small," Obama said.