Sargsyan became prime minister, emerging as the de facto decision-maker in Armenia with effective control of the military and the legislature. In the May 1999 elections, their reform-minded alliance secured a comfortable majority in the National Assembly. After his relations with Kocharyan deteriorated, Sargsyan merged the influential war veterans group Yerkrapah into the Republican Party and joined forces with Armenia's ex-communist leader Karen Demirchyan. After strongly supporting Ter-Petrosyan to retain power in 1996, he forced the president out of office in 1998 due to the latter's support for concessions in the Nagorno-Karabakh settlement negotiations, and helped Prime Minister Robert Kocharyan to be elected president. In the post-war years, Sargsyan tightened his grip on the Armed Forces of Armenia, establishing himself as a virtual strongman. In different positions, he regulated the military operations in the war area until 1994, when a ceasefire was reached ending the war with Armenian forces controlling almost all of Nagorno-Karabakh and seven surrounding districts.

Appointed defence minister by President Levon Ter-Petrosyan soon after Armenia's independence from the Soviet Union in late 1991, Sargsyan became the most prominent commander of Armenian forces during the First Nagorno-Karabakh War. He rose to prominence during the mass movement for the unification of Nagorno-Karabakh with Armenia in the late 1980s and led Armenian volunteer groups during the early clashes with Azerbaijani forces. He served as Armenia's Prime Minister from 11 June 1999 until his assassination on 27 October of that year. He was the first Defence Minister of Armenia from 1991 to 1992 and then from 1995 to 1999. Vazgen Zaveni Sargsyan ( Armenian: Վազգեն Զավենի Սարգսյան, pronounced 5 March 1959 – 27 October 1999) was an Armenian military commander and politician. Head of the Supreme Council Commission on Defence and Internal Affairs State Minister on Defence, National Security and Internal Affairs

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