Turkish warplanes have confronted Russian jets over the Black Sea, as NATO aircraft also tracked Russian strategic bombers over the Atlantic and sorties of fighters over the Baltic, in what the Western alliance called an unusual burst of activity at a tense time in East-West relations.

In all, NATO said in a statement, its jets had intercepted four groups of Russian aircraft in about 24 hours since Oct. 28, and some were still on maneuvers late on Oct. 29 afternoon.

“These sizeable Russian flights represent an unusual level of air activity over European airspace,” the alliance said. […]