Bloomberg News Shoppers with umbrellas walk along Takeshita Street in Tokyo.It was a bit of a herky-jerky morning for Asian stocks, colored by currency swings, optimism about the Korean Peninsula and a fresh slump in oil prices. Stock indexes in a number of markets were already swinging between gains and losses, including Japan, Hong Kong and China. The Nikkei NIK, +0.13% finished the morning with a 5.52-point drop as the yen weakened and then rebounded. Meanwhile, benchmarks in South KoreaSEU, +0.74% and Taiwan Y9999, +0.42% were higher throughout the morning. Airlines and electronics stocks helped the Nikkei start on the right foot; ANA9202, +2.18% was 2.2% higher. Meanwhile, Tokyo Electron 8035, +0.35% rose a further 1.5% and Sony 6758, +2.01% was up 2% as the dollar USDJPY, +0.05% climbed to ¥109.70. And as is the norm, falling Treasury yields were hitting Japanese life insurers, with Dai-ichi 8750, -0.40% off more than 1%. Korea’s Kospi was up early, even with Samsung 005930, -0.76% pulling back to start the week as steelmaker Posco 005490, +2.31% and Korea Electric Power015760, +2.34% each rebounded following Friday skids.via