Tensions rise as Russia intercepts US drone in Black Sea.

The US military surveillance drone that crashed into the Black Sea may never be recovered after being intercepted by Russian fighter jets, worsening taut relations between Washington and Moscow. The incident over international waters on Tuesday was a reminder of the risk of direct confrontation between the United States and Russia over Ukraine. The State Department summoned Russia's ambassador to the United States, Anatoly Antonov, to express US concerns over the encounter. US officials have stressed that the United States would continue to fly over international waters in the area.