By Herbert Lash NEW YORK (Reuters) – Gold prices jumped to an eight-month high and safe-haven debt rose on Thursday after U.S. President Joe Biden said there was every indication Russia planned to attack Ukraine, while Moscow accused Washington of ignoring its security demands. A gauge of global equities fell more than 1% despite strong corporate earnings in Europe as the Ukraine standoff deepened. Russian-backed separatists and Ukrainian forces accused each other of firing shells across a cease-fire line and Britain said Russia sought to fabricate a pretext to invade. Speaking to the United N…