(Reuters) - Moscow and Washington have accused each other of destabilising the South Caucuses region, as thousands of ethnic Armenians fled their homes in Nagorno-Karabakh over ethnic cleansing fears. "I do think that Russia has shown that it is not a security partner that can be relied on," U.S. State Department spokesman Matthew Miller told reporters. Thousands of ethnic Armenians fled the breakaway region of Nagorno-Karabakh by Monday after their fighters were defeated by Azerbaijan in last week's lightning military operation. Baku has promised to protect the rights of the roughly 120,000 Armenians who call Karabakh home but many refuse to accept its assurances. Moscow has said Armenia only had itself to blame for Azerbaijan's victory over Karabakh because it flirted with the West rather than working with Moscow and Baku for peace.

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Persons: Anatoly Antonov, Vladimir Putin, Matthew Miller, Nikol Pashinyan, Samantha Power, Yuri, theArmenians, Lidia Kelly, Michael Perry Organizations: Reuters, US State Department, U.S . State Department, Monday, Azerbaijan, Karabakh, Armenia's, U.S . Agency for International Development, USAID, . State, U.S, aMoscow Locations: Moscow, Washington, Nagorno, Karabakh, Armenia, Russia, Soviet Union, Ukraine, U.S, Baku, South Caucasus, United States, Turkey, Iran, Europe, Azerbaijan, aroundNagorno, Melbourne