Cold War ended and the Soviet Union disintegrated, and Sino-Russian relations gradually improved. In 1996, China and Russia became a strategic partnership of coordination. In 2004, China and Russia signed a supplementary agreement on the eastern section of the Sino-Russian border, which resolved the historical border issue. In 2014, the Ukraine crisis occurred, and China remained neutral and did not join the Western camp to condemn Russia. In 2019, China and Russia became a "comprehensive strategic partnership of coordination in the new era", reaching a high point of cooperation since the 1950s.
Economically, China and Russia are very telemarketing list complementary, and Russia has become the number one country in China's oil imports; militarily, since 2012, China and Russia have started joint maritime military exercises, covering the East China Sea, the South China Sea, the Mediterranean Sea, the Baltic Sea and the Sea of Japan. In addition, China and Russia have also used the Shanghai Cooperation Organization as a platform to hold anti-terrorism and peaceful rescue exercises to effectively deter anti-government organizations in Central Asia and Xinjiang.
Military analysts point to China's participation in Russian exercises to reinforce its lack of actual combat experience. In addition, China’s military purchases are also dominated by Russia. This year (2020) Russia has sold precision weapons to China, including the Sukai 35 (Su-35) fighter jet and the S-400 surface-to-air missile system, although it was reported to China in July. Stealing Russian secrets, angering Russia, and suspending the delivery of S-400s to China, but over the years these Russian precision weapons have greatly enhanced the PLA's combat power against the US military in the South China Sea and the Taiwan Strait.