Education
He graduated as jurist and received the title varatuomari in 1915.
He graduated as jurist and received the title varatuomari in 1915.
After the Finnish independence in 1917, Yrjö-Koskinen served under the Ministry for Foreign Affairs as Chief of political division from 1924 and Chief of staff from 1929. He worked as an ambassador in Moscow between 1 January 1931 and 8 April 1940. Yrjö-Koskinen also served as the Finnish Foreign Minister between 21 March 1931 and 14 December 1932.
During his ministry Yrjö-Koskinen signed on behalf of Finland the Soviet–Finnish Non-Aggression Pact with the Soviet Union.
At beginning of the Winter War he moved from Moscow to the Finnish embassy in Ankara. Yrjö-Koskinen served in Turkey till 1950, and yet a small time in The Hague, the Netherlands.