The United Nations’ Paris-based cultural agency UNESCO has promised to stand “at France’s side” to restore the site, which it declared a world heritage site in 1991. The German and Italian governments have also offered to help in the reconstruction, while Russian President Vladimir Putin offered to send “the best Russian specialists with rich experience in the restoration of national heritage monuments.” The painstaking renovation work is likely to cost hundreds of millions of euros over several years, if not decades, though experts breathed sighs of relief that the damage was not even worse. The steeple of the gothic edifice had been undergoing an 11-million euros ($12.4-million) overhaul financed by the French state to repair damage inflicted by time, pollution and the weather.