Putin said he won't invade. Then he said Kyiv will fall in three days. Then conducted fake referendums, "annexing" territories he doesn't control. Izyum was

Putin said he won't invade. Then he said Kyiv will fall in three days. Then conducted fake referendums, "annexing" territories he doesn't control. Izyum was declared a part of Russia forever from now on, and that "forever" lasted two days. So, this "doing what he says" doesn't quite check out. As for casus belli - against whom exactly? And why would Russia need any casus belli?