Black Sea

A day after Moscow suffered a stinging symbolic defeat with the loss of the flagship of its Black Sea fleet, Russia's Defense Ministry has promised to ramp up missile attacks on the Ukrainian capital.

Military experts say Russia would face stronger resistance from Ukraine than it did when it annexed the Crimean Peninsula seven years ago

Russia's military already has three of the S-400 "Triumf" divisions on the Black Sea peninsula; it plans to have another in place and operational by the year's end.

The vessel dates back 2,400 years to the days of ancient Greece. "This will change our understanding of shipbuilding and seafaring in the ancient world," says archaeologist Jon Adams.

The State Department says that the encounter between a Russian Su-27 fighter and a propeller-driven U.S. Navy EP-3 put the American crew at risk.

Officials in Russia say they do not consider terrorism to be a likely cause of the crash on Sunday morning. The plane crashed shortly after takeoff; all 92 people on board are believed to have died.