Chinese President Xi Jinping began welcoming dignitaries including United Nations chief Antonio Guterres and Egyptian Premier Moustafa Madbouly on Saturday before a summit attended by leaders from more than 20 countries.
The Shanghai Cooperation Organisation gathering will be held in the northern port city of Tianjin on Sunday and Monday, days before a massive military parade in nearby Beijing to mark 80 years since the end of World War II.
North Korea's Kim Jong Un will be among some 26 world leaders slated to attend the parade.
The SCO comprises China, India, Russia, Pakistan, Iran, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan and Belarus. Sixteen more countries are affiliated as observers or "dialogue partners".
Russian President Vladimir Putin and Indian Prime Minister Narendra M