Vitaly V. Kuzmin /

A pair of Su-34 fighter-bomber jets collided mid-air over the Tatar Strait in Russia's far eastern Khabarovsk Territory.

"Two Su-34 aircraft flying from the sea collided mid-air. The crew of one aircraft ejected. The fate of both crews is unknown yet," a source in the regional law enforcement agencies told TASS.

According to the source, the incident occurred in the morning hours of Friday, Jan 18.

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A search and rescue operation is underway why the fate of the crew remains unclear.

"The version is being checked that the pilots failed to properly calculate the safe distance between the two aircraft, or there was a technical malfunction, and two planes could supposedly collide," writes Interfax.

As reported earlier, on December 20, an An-26 cargo plane with Russians on board crashed in the Democratic Republic of the Congo (DRC).