By Humeyra Pamuk and Kirsty Needham MELBOURNE (Reuters) – Climate change, COVID and China’s “coercion” in the Indo-Pacific will top the agenda when foreign ministers of the Quad – an informal grouping of Australia, India, Japan and the United States – convene in Melbourne on Friday. U.S. Secretary of State Antony Blinken arrived in Australia this week with Washington consumed by an escalating crisis with Russia, which has massed some 100,000 troops near Ukraine’s border and stoked Western fears of an invasion. Moscow denies it has such plans. The Biden administration wants to show the world th…