The number of joint stamp issues has been growing over the past few years
Mongolia
In August 2014, Russia and Mongolia issued a lozenge-shaped stamp to celebrate the 75th anniversary of the joint victory of Soviet and Mongolian troops over Japanese aggressors at Khalkhin-Gol in 1939.
The Battles of Khalkhin Gol (also known as Nomonhan Incident) were part of the undeclared border conflict between the USSR and Mongolia on one side and Imperial Japan and its puppet state of Manchukuo on another.
North Korea
North Korea and Russia agreed to make 2015 a “year of friendship” to mark the 70th anniversary of two major events - North Korea’s liberation from Japanese occupation and the Soviet victory in World War II. The stamps show the flags of both countries.
The North Korea – Russia year of Friendship. May 1, 2015. Source: rusmarka
Later in 2015, Russia and North Korea issued a stamp that features the second tallest triumphal arch in the world, the Arch of Triumph (standing 60 m high and 50 m wide), which was built to commemorate the Korean resistance against Japan from 1925 to 1945.
The Arch of Triumph in Pyongyang. Aug. 28, 2015. Source: rusmarka
Thailand
In July 1997, Russia and Thailand issued two stamps to celebrate the 100th jubilee of the establishment of diplomatic relations.
The 100th jubilee of the establishment of Russia - Thailand diplomatic relations. June 20, 1997. Source: rusmarka
The first stamp shows the flags of both countries, while the second one is dedicated to the first visit of King Rama V to Russia in 1897. The stamp features the summer residence of the Russian emperors, the Peterhof Palace, where the Thai king spent his first days in Russia.
Australia
The USSR-Australia collection represents neither friendship nor the establishment of diplomatic relations, but shows the scientific cooperation between two countries. On June 13, 1990, the USSR and Australia released a stamp collection highlighting joint scientific research in the Antarctic. The stamps were illustrated by Soviet artist Yury Artsimenev and Australian graphic designer Janet Boschen.
Scientific research in Antarctic: flora and fauna. June 13, 1990. Source: rusmarka.
The USSR and India through the eyes of children. Aug. 8, 1990. Source: rusmarka
On May 18, 1999, China and Russia released a stamp collection, which depicted red deer in both countries. Red deer, also known as wapiti, are found in Europe, southeastern Siberia, northeastern Mongolia, North Korea, North America and North Africa. In China, they live in Inner Mongolia, Sichuan province and Tibet. Red deer are also listed as protected animals worldwide.
Red deer. May 18, 1999. Source: rusmarka