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"We recognize the need for routine military training, but in recent months we have noticed a rise in the number of such flights around North America," Psaki said.

"We do not think that the current situation in the Western Atlantic, the eastern part of the Pacific Ocean, the Caribbean Sea and the Gulf of Mexico requires [Russia to make] any additional flights outside its airspace," she added.

"Any such activity should correspond to international law, and it is necessary to take into consideration the views of other countries and the safety of other aircraft and ships," Psaki said.