Premarket: Global stocks wobble as Fed's Powell urges caution

European shares fell on Thursday, while the dollar rose as traders took some heart from trade talks between the U.S. and Japan, and gold hit a new record as Federal Reserve Chair Jerome Powell added a note of caution about the growth outlook. With a long weekend ahead, investors were reluctant to double down too heavily on the broad-based decline in risk assets this week. U.S. President Donald Trump unexpectedly joined talks in Washington on Wednesday with a delegation from Japan, saying later that "big progress" had been made in the discussions with lead Japanese negotiator Ryosei Akazawa, but giving…