During his diplomatic career, Aleksei Samosuev has served in various tasks in the Ministry of Foreign Affairs of Belarus, mainly in the area of development policy with Russia, the CIS Countries and Eurasian Integration. Also he has worked as chief Counsellor for External Policy in the Administration of the President of the Republic of Belarus, has experience with the EU.
In October 2018 Aleksei Samosuev was appointed as Ambassador of Belarus in Finland.