Russian President Vladimir Putin has ordered retaliation to a deadly Ukrainian attack on what he said was a college dormitory in an occupied town which authorities say killed at least 12.

Russia launched waves of deadly airborne attacks across eastern regions of Ukraine which responded with retaliatory drone strikes into southern Russia.

One wave of strikes hit a Russian drone pilot training camp, killing at least 65 cadets and an instructor, Ukraine claims.

At least 6 dead, over 39 injured...