Watch video: Did Russian troops use chemical weapons in Mariupol? 
                            Experts called the evidence 'thin' and raised doubts about use of these highly controversial and regulated substances
             
            
                                    Deutsche Welle
                                                    Published 20.04.22, 07:26 PM
                            
                            
                    
                        
                             
                        
                                                    UK probing claims of Russian chemical attack in Ukraine
                                                                    Deutsche Welle