Putin reiterates nuclear threat as Ukraine launches drone strikes on Russian oil refineries
                        
                                                    
                                
                                
                                
                                
                                
                                    Ukraine launched a sweeping drone attack on Russian regions on Wednesday, causing a fire at Rosneft's biggest oil refinery in what President Vladimir Putin said was an attempt to disrupt Russia's presidential election.                                
                            
                        
                        
                                                    
                        
                        
    
    
        
            
            
        
        
    
                        
                            Ukraine launched a sweeping drone attack on Russian regions on Wednesday, causing a fire at Rosneft's biggest oil refinery in what President Vladimir Putin said was an attempt to disrupt Russia's presidential election.