President Vladimir Putin stands in driver's cabin of the shortened three-carriage train for the official opening of the railway bridge that links annexed Crimea to southern Russia.
Engineers at the Massachusetts Institute of Technology say that had it been built, a design for a bridge in the transcontinental city would have been viable.
A partially-constructed bridge collapsed in central Colombia, killing at least nine construction workers and wounding five others.
UK authorities also lowered the death toll from Wednesday's attack to three, excluding the attacker.
Saudi King Salman and Egyptian President el Sisi agree to sign $15B investment fund
Saudi Arabia's King Salman announces bridge will be built over Red Sea linking his country with Egypt
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