One mistake is all it takes

The Dark Lord is in full power, slowly trying to take over Moscow and through that the whole Russia. How did this happen? Where the fuck is Harry Potter and what did Draco Malfoy do? How does Scorpius Malfoy fit into this story and where the hell is Severus Snape? WARNING: Major Characters die here. It's a one shot. Something that I thought of and then just simply written. ENJOY!