By Gregor Stuart Hunter SINGAPORE (Reuters) -Asian stocks dived on Wednesday and market volatility surged to levels not seen since April after an overnight tech-led selloff on Wall Street put the spotlight on stretched valuations. Sellers were particularly harsh on both the Japanese and South Korean markets in early trading with Tokyo's stock index tumbling 4.5%, down almost 7% from a record high reached on Tuesday. South Korean shares plunged as much as 6.2%. MSCI's broadest index of Asia-Pacific shares outside Japan was down 2.3%, the most since U.S. President Donald Trump's Liberation Day tariff announcement in early April. U.S. e-mini futures slumped 0.6% after a 1.2% drop for the S&P 500 overnight. In Japan, shares in SoftBank Group dived 10% as one of the world's biggest tech sector

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