Yesterday newly appointed Armenian Ambassador to US Tatul Margarian handed his credentials to US Secretary of State Condoleezza Rice, press service of the RA Foreign Ministry reported. During the meeting the parties discussed the Armenian-American relations, regional processes and settlement of the problem available. Tatul Margarian thanked the US for the assistance rendered, constructive participation of official Washington in the settlement of regional problems and said he will spare no effort for strengthening and development of the bilateral cooperation.