"We will take all necessary means to safeguard our rights and interests," said a Chinese Defense Ministry spokesman.
The bombers were "a hazard to all other aviation," the Ministry of Defence said.
A new report says Chinese nuclear-capable bombers are "likely training for strikes against U.S. and allied targets."
Lieutenant General Kenneth McKenzie said the U.S. would continue to conduct operations around the Chinese bases despite criticism from Beijing.
The red, white and blue coats and parkas come equipped with innovative heat technology.
The air forces have begun five days of drills.
The Black Sea is a priority area of reinforcement for the Russian navy following the annexation of nearby Crimea in 2014.
Moscow and Tehran are taking their collaboration in Syria to a new level.
National daily 'Kommersant' estimates the operation has more than paid for itself.
The bombers were contacted by Chinese ground controllers but continued their mission undeterred.
Sweden said it had intercepted two Tu-22M "Backfire" bombers heading toward the Swedish island of Oland.
North America has intercepted over 50 Russian fighter jets encroaching on U.S. and Canadian airspace in the past five years