The streets and even its famed markets stood largely empty as AFP journalists visited on Wednesday, and schools were to be closed for the two days of the summit.
Security was tight across the city, with a huge police presence on the streets and armored vehicles parked downtown.
The SCO — made up of China, Russia, India, Pakistan and the ex-Soviet Central Asian nations of Kazakhstan, Uzbekistan, Kyrgyzstan and Tajikistan — was set up in 2001 as a political, economic and security organization to rival Western institutions.
It is not a formal military alliance like NATO or a deeply integrated bloc like the European Union, but its members work together to tackle joint security issues, cooperate militarily and promote trade.
The summit’s main joint session will be on Friday but much of the focus will be on bilateral talks.
As well as Xi, Putin will meet Thursday with Iranian President Ebrahim Raisi and Pakistani Prime Minister Shehbaz Sharif, then on Friday with Indian premier Narendra Modi and Turkish leader Recep Tayyip Erdogan.
Iran is an SCO observer state and Erdogan has been a key broker in deals between Russia and Ukraine on issues like grain shipments.
– ‘No-limits’ friendship –
It was not clear who Xi might meet separately, though talks with Modi would be their first since 2019, after relations between China and India turned frosty over deadly fighting in 2020 on their disputed Himalayan border.
Xi arrived in Kazakhstan on Wednesday for the start of his Central Asian tour, holding talks with President Kassym-Jomart Tokayev.
Formerly Cold War allies with a tempestuous relationship, China and Russia have drawn closer in recent years as part of what they call a “no-limits” relationship acting as a counterweight to the global dominance of the United States.
Xi and Putin last met in Beijing in early February for the Winter Olympic Games, days before Putin launched the military offensive in Ukraine.
Beijing has not explicitly endorsed Moscow’s military action, but has steadily built economic and strategic ties with Russia over the six months of the conflict, with Xi assuring China’s support of Russian “sovereignty and security”.
Russia has in turn backed China over Taiwan, calling US House Speaker Nancy Pelosi’s visit to the island this summer a “clear provocation”.
There were more signs of ties being bolstered in recent weeks.
Beijing sent hundreds of troops to take part in joint military exercises in Russia’s Far East, and Moscow recently announced that China would be switching from US dollars to yuan and rubles to pay for deliveries of Russian natural gas.