WASHINGTON, June 9 (Reuters) - The United States and five of its allies on Friday condemned the use of trade practices that amount to economic coercion in a joint declaration that did not single out other countries but appeared to be aimed at China. Australia, Britain, Canada, Japan, and New Zealand jointly released the statement with the United States, emphasizing that "trade-related economic coercion and non-market-oriented policies and practices" threatened the multi-lateral trading system and "harms relations between countries." The statement comes after the Group of Seven leaders last month agreed to a new initiative to counter economic coercion and...