evidence: HEIXIAZI ISLAND, Heilongjiang -- One hundred and fifty Chinese tourists landed on the Chinese part of Heixiazi Island, a Sino-Russian border island in northeast China's Heilongjiang Province, on Wednesday morning. [...] "I'm so lucky to be part of the first group of tourists to visit Heixiazi," said Yu Zaifu, a resident of Harbin, the capital of Heilongjiang. [...] "Many people came here simply for the stone. Heixiazi is not only a border island, it is a witness to a history of conflict and friendship between China and Russia," she said.