- Summary- Armenia complains CSTO inaction has damaged alliance's image- Putin: more work needed towards Armenia-Azerbaijan peace deal- Distracted by war, Russia risks losing influence in regionLONDON, Nov 23 (Reuters) - Armenia's leader vented his frustration on Wednesday at the failure of a Russian-led security alliance to come to his country's aid in the face of what he called aggression by Azerbaijan.Russia, the dominant player in the CSTO, has long been the main power broker in the south Caucasus, bordering Turkey and Iran, where Armenia and Azerbaijan have fought two major wars since the collapse of the Soviet Union in 1991.The two countries have been wrangling for decades over Nagorno-Karabakh, an enclave internationally recognised as part of Azerbaijan but largely controlled by the majority ethnic Armenian population, with support from Yerevan.In his own remarks, Putin acknowledged some unspecified "problems" facing the CSTO, and said more effort was needed to bring about peace between Azerbaijan and Armenia.Azerbaijan enjoys backing from Turkey and is not a member of the CSTO, which comprises Belarus, Kazakhstan, Kyrgyzstan and Tajikistan as well as Russia and Armenia."