"It took several seconds for the round to hit the commander, who appeared to fly into several pieces."
The battlefield may never be the same again after humans followed remote-controlled military vehicles into battle.
Russia dismissed jokes by U.K. Defense Secretary Michael Fallon and called the new HMS Queen Elizabeth "a large, convenient naval target."
The report is based on one training exercise carried out in Ukraine.
The battle began on July 1, 1916, and turned the tide for the Allies.
The Russian Ministry of Defense said it was "amazed" by London's response.
The Defense Ministry is doing "physiological research" before making a decision.
World-renowned photographer Rankin has collaborated with a London veterans charity for the project.
Chancellor George Osborne committed to the target of 2% of GDP set by NATO.
Ex-army officers say a militarized Russia and returning British jihadists mean defense must be protected.