By Caroline Valetkevitch NEW YORK (Reuters) – Stocks on global indexes were lower on Tuesday while U.S. Treasury yields rose to multi-year highs as comments from U.S. Federal Reserve Governor Lael Brainard put investor focus on the possibility of aggressive monetary policy tightening. Yields took off after Brainard said she expects rapid reductions to the Fed’s balance sheet alongside methodical increases to the benchmark rate. Wednesday brings the release of minutes from the Fed’s last policy meeting. The ECB will publish its equivalent minutes on Thursday. The yield on 10-year Treasury notes…