YEREVAN.- Armenia's President Armen Sarkissian sent official letters to OSCE Secretary General Thomas Greminger (copy to OSCE/ODIHR Director Ingibjörg Sólrún Gísladóttir) and CIS Executive Committee Chairman, Executive Secretary Sergey Lebedev inviting the OSCE Office for Democratic Institutions and Human Rights, as well as the CIS member states’ mission to observe the snap parliamentary elections in Armenia which will be held on December 9, 2018, Sarkissian’s Office reported.