sentences:  After declaration of the First Republic of Armenia, he served as Foreign Minister and signed the Treaty of Batum with the Ottoman Empire.He was elected as the prime minister from 1919 to 1920.Hovhannes Kajaznuni ( ("Yovhannēs Kajaznuni")) (Akhaltsikhe, Georgia 1868 – Yerevan, Armenia 1938) was the first Prime Minister of the First Republic of Armenia from 30 May 1918 to 28 May 1919.