TOKYO Asian stock markets were mostly lower Wednesday as investors kept a wary eye on developments in the Middle East after Turkey shot down a Russian warplane. KEEPING SCORE: Japan’s Nikkei 225 fell 0.4 percent to 19,847.58 and Hong Kong’s Hang Seng slipped 0.2 percent to 22,547.94. South Korea’s Kospi lost 0.3 percent to 2,009.42 and…