In recent history, when the Japanese needed an excuse to invade China in 1931, they fabricated what’s known as the Mukden Incident, the destruction of a railroad line in Manchuria. When the Germans invaded Poland in 1939, they fabricated what’s known as the Gleiwitz Incident, dressing up German soldiers in Polish uniforms to make it look like the Poles were the aggressors. In 1962 the US created Operation Northwoods, which plotted all kinds of incidents—shooting down a US airliner, sinking US ships—to blame it on Cuba. That plot was, fortunately, never executed.
This is standard operating procedure when you want to start a war. You need a casus belli—a cause of war—but you want to blame it on the other guy.