By Yimou Lee and Martin Quin Pollard TAIPEI/BEIJING (Reuters) – Chinese fighter jets crossed the median line of the sensitive Taiwan Strait on Friday in what the island’s government slammed as a provocation, as a senior U.S. senator visited Taipei for a meeting with President Tsai Ing-wen that China condemned. China claims democratically-ruled Taiwan as its own territory and has ramped up military and political pressure to try and force the island to accept Chinese rule. Taiwan’s Defence Ministry said the Chinese aircraft “intentionally crossed the median line of the strait in a provocative mo…