The April 1986 disaster at the Chernobyl nuclear power plant in Ukraine was a direct consequence of Cold War isolation and the resulting lack of any safety culture. While no-one in the West was under any illusion about the safety of early Soviet nuclear reactor designs, some lessons learned have also been applicable to Western plants. Since then, the safety of all Soviet-designed reactors has improved vastly. This is due largely to the development of a culture of safety encouraged by collaboration between East and West, and substantial investment in improving the reactors. Which one of the following statements can be inferred from the passage ?