Ukraine alleged Monday that Russia mixed bodies of its own dead soldiers among the Ukrainian military dead that have been returned, and that more than a million Russians have been killed since conflict began.

The shocking images of Air India's crash Thursday may leave some passengers worried, but flying is still the safest way to travel.

Here is a list of the deadliest plane disasters in the 21st century, excluding the Sept. 11, 2001, attacks: On July 17, 2014, Malaysia Airlines flight MH17 was shot down over rebel-held eastern Ukraine en route to Kuala Lumpur from Amsterdam. All 298 people aboard the Boeing 777 were killed, including 193 Dutch nationals.

An Air India Boeing 787-8 flight headed for New Delhi returned to Hong Kong shortly after takeoff Monday because of a "technical issue," Indian media reported.