(Reuters) – The Bank of Japan shocked markets on Tuesday with a surprise tweak to its bond yield controls that allows long-term interest rates to rise further, a move aimed at easing some of the costs of prolonged monetary stimulus. But the central bank kept its yield target unchanged and said it will sharply increase bond buying, a sign the move was a fine-tuning of existing ultra-loose monetary policy rather than a withdrawal of stimulus. Following are excerpts from BOJ Governor Haruhiko Kuroda’s comments at his post-meeting news conference, which was conducted in Japanese, as translated by …