He then served as the second secretary at the embassy in Stockholm (from May 1, 1924), the deputy consul at the Copenhagen consulate (from April 1, 1926), the second secretary at the embassy in London (from November 1, 1926), the first secretary at the Ministry of Foreign Affairs (from January 8, 1934), the head of the consular office (from January 7, 1935), the head of the office for the League of Nations (from January 1, 1936), the head of the office of the political department (from January 15, 1937), and a counselor at the Moscow embassy (from July 1, 1938 to August 26, 1940).
The Ministry of Foreign Affairs ordered Ojansoon to return to Estonia, which he did, traveling by train to Tallinn with his wife Margit.
They hoped that they had thus escaped danger, but after reaching Tallinn Ojansoon was arrested by the NKVD.
Ojansoon died in captivity in Russia, but the exact time and place of death are unknown.
[6] He was the brother-in-law of the writer Yri Naelapea, who was married to Alice Rosalie Ojanson (1899–1999).