TOKYO/SEOUL, March 16 (Reuters) - The leaders of Japan and South Korea promised to turn the page on years of animosity at a meeting on Thursday, putting aside their difficult, shared history and pledging to work together to counter regional security challenges. In a poll by Gallup Korea published Friday, 64% of respondents said there was no need to rush to improve ties with Japan if there was no change in its attitude, and 85% said they thought the current Japanese government was not apologetic about Japan's colonial history. Japan said the "strategic challenge posed by China is the biggest it has ever faced" in a defence strategy paper released in December