[2][3] During the 4 October 2004 Presidential election, Matosyan supported Sergei Shamba's candidacy, and he was one of the leaders of his Social-Democratic Party.
[4][5] On 14 December 2004, while Vladislav Ardzinba was still President, he issued a decree creating a Ministerial portfolio for Emergency Situations, and appointing Matosyan to this new post.
[2][5] 12 days after Sergei Bagapsh was sworn in as President on 12 February 2005, he repealed Ardzinba's decree and Matosyan did not return in the new cabinet.
[7] Matosyan was subsequently nominated by Adgur Kharazia for the post of third Deputy Speaker, but lost out to Albert Ovsepyan.
[8] On 24 September 2010, Matosyan was nevertheless elected Deputy Speaker (with 22 votes out of 24 cast in favour),[3] after Albert Ovsepyan had retired on 3 May on account of old age.