Asia shares helped by Nvidia high as investors unfazed by Trump's tariff moves

SINGAPORE (Reuters) -Asian stocks rose slightly on Thursday, riding on optimism from Nvidia's brief rise to a world-record $4 trillion valuation and as investors largely shrugged off U.S. President Donald Trump's latest tariff salvos. U.S. copper futures widened their premium to the London benchmark overnight after Trump announced plans to impose a 50% tariff on copper. Trump also turned his trade ire against Brazil on Wednesday as he threatened a punitive 50% tariff on exports to the U.S. and issued …