What is the development history of Sino-Russian relations?

The development of Sino-Russian relations can be traced back to the establishment of diplomatic relations between China and Russia in 1949, and has gone through several stages of development, including: 1949; 1960 signed the agreement on the establishment of diplomatic relations between China and Russia; 1989 sino-Russian friendly relations were officially restored; 200 1, China and Russia establish a comprehensive strategic cooperative partnership; 20 14, China and Russia signed the Sino-Russian strategic economic cooperation agreement; On 20 16, the heads of state of China and Russia signed the agreement on deepening cooperation between China and Russia; On 20 18, the heads of state of China and Russia issued a joint declaration on "Sino-Russian relations enter a new era"; In 20 19, the heads of state of China and Russia jointly issued a joint statement on the development of Sino-Russian relations.