A top US Navy official said on Wednesday that a mainland Chinese invasion of Taiwan could take place as soon as this year, based partly on comments by Chinese President Xi Jinping at a major political conference in Beijing this week…Asked how the US Navy should respond to Xi’s warning at the 20th party congress about Taiwan separatism, Admiral Michael Gilday, chief of US naval operations, said: “It’s not just what President Xi says, but it’s how the Chinese behave and what they do.