Matosyan was first elected to the
People's Assembly of Abkhazia in 1996, which he left in 2000 to become Deputy Minister for the Interior responsible for staffing. 12 days after
Sergei Bagapsh was sworn in as President on 12 February 2005, he repealed Ardzinba's decree and Matosyan did not return in the new cabinet. Matosyan was again elected to the People's Assembly in the
4 March 2007 election, winning a first round victory in the Pshap constituency no. 22. Matosyan was subsequently nominated by
Adgur Kharazia for the post of third Deputy Speaker, but lost out to
Albert Ovsepyan. On 24 September 2010, Matosyan was nevertheless elected Deputy Speaker, after Albert Ovsepyan had retired. At the 11 May 2007 founding congress of the opposition veterans' organisation
Aruaa, Matosyan was elected into its supreme council. ==Administrative and later career==