Russian Federation was set to begin its largest military exercise since the Cold War on Tuesday, involving more than 300,000 military personnel, including forces from neighbouring China and Mongolia.
Dubbed Vostok 2018, the enormous exercise will include nearly 300,000 troops, more than 1000 planes, helicopters and drones and around 36,000 tanks, bombproof labor force conveyers and other vehicles as per the Russian officials.
Vostok-2018 is taking place at a time of heightened tension between the West and Russian Federation, and North Atlantic Treaty Organisation has said it would monitor the exercise closely, as would the USA, which has a strong military presence in the Asia-Pacific region.
The main aim was to check the military's readiness to move troops large distances, to test how closely infantry and naval forces cooperated, and to ideal command and control procedures.
Xi, who has been at loggerheads with the USA over trade, said he believed building strong relationships with Russian Federation was vital.
Zapad-81 Soviet war games were the largest exercises ever held back in 1981, with about 100,000 to 150,00 troops participating.
Warships equipped with Kalibr missiles, which have been deployed in Syria, will also play their part in the drill as forces are tested in real combat conditions. The drills are underway at five military training grounds in Russia's Far East region, and in the waters of the East Sea, the Bering Sea and the Sea of Okhotsk. China's military said it has sent 3,200 soldiers, as well as 900 tanks and armor vehicles.
Besides their size, the drills have attracted attention because of the participation of Chinese troops, the first time they have been invited by Russian Federation to take part in an exercise of this scale.
"Cooperation in traditional security fields between China and Russian Federation has a very clear target [the United States]", he said.
Russian military analyst Pavel Felgenhauer said the games were a "preparation for a future world war".
Russian Federation has denied the drills are a cause for worry.
According to the South China Morning Post, Vostok 2018 began on Tuesday with the goal of enhancing the counter-attacking capabilities of both armed forces as well as reinforcing each other's military ties.
Putin is preparing his military for "warfare on a huge scale" to satisfy "delusions" that Russian Federation can defeat Western nations in a global conflict, according to an expert on his armed forces.