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- On December 28, the Russian IL-114LL aircraft conducted counter-surveillance flight, when the U.S. Boeing P-8A Poseidon was flying along the western Crimean coast;
- On December 29, the U.S. RC-135V Rivet Joint and CL-600 ARTEMIS were spotted over the Black Sea;
- On December 30, the U.S. Bombardier Challenger 650 ARTEMIS, Boeing RC-135V Rivet Joint and British RC-135E were spotted over the Black Sea;
- On December 31, the U.S. Bombardier Challenger 600 was spotted over the Black Sea.
