The joint drill between the Chinese and Russian navies is expected to improve the two forces' capability to conduct maritime defense operations, Chinese experts said on Tuesday.
Putin swims the butterfly during his vacation outside the town of Kyzyl in southern Siberia on Aug 3, 2009.
Chinese President Xi Jinping extends a warm welcome to Russian President Vladimir Putin who is visiting China for the first time since Xi took office.
While Asia has become the world's most economically dynamic region, security cooperation has been a weakness.
The upcoming Asian security summit is important for Iran due to the meeting's "significant" role in working toward world peace, Iranian President Hassan Rouhani said here Tuesday.