Kulminski has also worked on the World Bank on issues related to Moldova.

[2][3] Kulminski was secretary of state for the Ministry of Foreign Affairs and European Integration of Moldova.

[2] He was also designated as a member of the Supreme Security Council on 25 January 2021 by the President of Moldova Maia Sandu.

He also stated that he had already clarified to Moldovan officials that he would probably make this decision weeks before his formal resignation.

[5] Afterwards, Oleg Serebrian was appointed as Kulminski's successor as Deputy Prime Minister for Reintegration on 19 January 2022.