Infuriated by the Ukrainian military’s plan to carry out a major combat missile test near the coast of the Russian-occupied Crimean peninsula, a senior Russian government official has warned Kyiv that Moscow would launch a retaliatory strike if the test went ahead as scheduled on Dec. 1-2.

Speaking at the International Conference of Scientific Research, Konstantin Kosachev — the Foreign Policy Committee chair of the Federation Council, the Russian parliament’s upper house – said Ukraine risks sparking a major international crisis if it follows through with the test in what he called “Russian airspace.”