What were the main directions of Soviet foreign policy in the Far East in the 30s?

The main direction of the USSR’s foreign policy in the Far East was relations with Japan, which controlled the Korean Peninsula and, since 1931, part of northeastern China. Relations with her were strained, including due to the presence in Manchuria of the White emigration hostile to the USSR. In 1938, it came to battles on Lake Hasan (now it is near the border of Russia and the DPRK), and in the summer of 1939 to a full-fledged battle on the Khalkhin-Gol River on the border of Mongolia and China (in those years there was a puppet pro-Japanese state of Manchukuo). After this battle, a pact of neutrality was concluded with Japan.

The second destination was Mongolia. socialism was also built there and relations with it were good, they even began to build a railway there, and the Mongols switched to the Cyrillic alphabet.

Relations with China were good, the USSR traded with it and helped in the fight against the Japanese.