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Moscow has threatened retaliation against Israel Tuesday after Syria shot down a Russian military aircraft with 15 people on board over the Mediterranean Sea.
Russian Defence Minister Sergei Shoigu told his Israeli counterpart Avigdor Lieberman the blame "fully rests with Israel", adding that Russia "reserves the right to take further steps in response."
https://www.euronews.com/2018/09/18/russian-plane-disappears-amid-french-and-israeli-strikes