From calling up hundreds of thousands of additional troops to declaring four regions of Ukraine to be part of Russia without controlling them, President Vladimir V. Putin of Russia has used speeches to try to maintain public support for a war in which his country has endured setback after setback. Here are a handful from the past year: Feb. 24 Mr. Putin declares war on Ukraine in a televised address riddled with falsehoods, calling Moscow’s full-scale invasion the start of a “special military operation” to “demilitarize and denazify Ukraine.” He frames the invasion as a precautionary act against Western aggression,...