The premiers of China and Japan agreed to set up a hotline following a series of tense naval incidents, and to resume formal talks on jointly exploring seabed energy resources. <br/> <br/>China's Premier Wen Jiabao met his Japanese counterpart Yukio Hatoyama in Tokyo weeks after Chinese naval helicopters twice buzzed Japanese destroyers, and a Chinese marine survey ship pursued a Japanese coastguard vessel. <br/> <br/>A Japanese foreign ministry official said following the talks that the Japanese prime minister said the recent Chinese activities near Japan had raised concerns and he requested that such actions never be repeated. <br/> <br/>The official said that the two sides agreed to set up a hotline so that telephone conversations can be made without any delay and the new hotline would be between political leaders, not defence chiefs. <br/> <br/>The world's second and third biggest economies are rivals for energy and mineral resources and have competing claims to parts of the East China Sea, where their exclusive economic zones overlap. <br/> <br/>The helicopter incidents came as Japanese destroyers were watching a Chinese flotilla, including submarines, sailing in international waters between Japanese southern islands, an act seen as provocative by Tokyo. <br/>