Why not? Why should Russia be "annexing" anything? Yeah they have a history of warring all over Europe and Asia so it's no surprise a million of them died in Ukraine. It's also fact that many million Ukrainians were murdered and starved by Russians in the 20th century during the last "annexation". Maybe Putin should forget the imperialistic dreams and keep his own country growing by fostering trade and mutual prosperity.
Because it would result in the end of civilization and at least 1 billion humans.