GLOBAL MARKETS-Dollar resumes climb after Yellen underscores U.S. job woes

* Dollar index touches 2014 high * European shares wobble as Russia convey enters Ukraine * Treasuries yields rise (Adds dollar gains, Wall Street open; changes dateline; previous LONDON) By Michael Connor NEW YORK, Aug 22 (Reuters) - The high-flying dollar moved higher again on Friday after Federal Reserve Chair Janet Yellen said the worrisome U.S. labor markets requires policymakers to move cautiously when eyeing interest rate hikes. The U.S. dollar index, which values th