LONDON—Oil prices broke above $100 a barrel for the first time since 2014, stock markets slumped and the rouble hit a record low on Thursday after Russian President Vladimir Putin launched an invasion of Ukraine. Markets displayed all the predictable reactions. Europe’s, main stock markets opened 2.5 percent–4 percent lower, and benchmark government bonds, the dollar, Swiss franc, Japanese yen, and gold all rallied in a move to safety. Putin said he had authorized what he called a special military operation and the Ukraine government accused Moscow of launching a full-scale invasion. The United States and its allies will impose “severe sanctions” on Russia after the attacks, President Joe Biden said. Europe’s leaders said they would freeze assets and shut Russian banks out of its financial markets. Russian and Ukraine markets went in freefall. The rouble weakened nearly 7 percent to an unprecedented 86.98 per dollar and there were 10 …