in order to recover its debt from the Eurodif investment and to get the enriched uranium delivered. French hostages were taken in Lebanon from spring 1985; in 1986, terror attacks were perpetrated in Paris and Eurodif manager Georges Besse was assassinated. In their investigation La République atomique, France-Iran le pacte nucléaire, David Carr-Brown and Dominique Lorentz pointed to the Iranian intelligence services' responsibility. It was later ascertained, however, that the assassination was committed by the left-wing terror group Action directe. On 6 May 1988, French premier Jacques Chirac signed an accord with Iran: France agreed to accept Iran as a shareholder of Eurodif and to deliver enriched uranium "without restrictions". In 1987–88, Argentina's National Atomic Energy Commission signed an agreement with Iran to help in converting the reactor from HEU fuel to 19.75 percent low-enriched uranium, and to supply the latter fuel to Iran. According to a 2006 Argentine report, during the late 1980s and early 1990s the US pressured Argentina to terminate its nuclear cooperation with Iran, and from early 1992 to 1994 negotiations between Argentina and Iran took place with the aim of re-establishing the three agreements made in 1987–88. Some have linked attacks such as the 1992 attack on Israeli embassy in Buenos Aires and the AMIA bombing as part of an Iranian campaign to pressure Argentina into honoring the agreements. The uranium was delivered in 1993. 1990–2002 From the beginning of the 1990s, Russia formed a joint research organization with Iran called Persepolis which provided Iran with Russian nuclear experts, and technical information. Five Russian institutions, including Roscosmos, helped Tehran improve its missiles. The exchange of technical information with Iran was personally approved by SVR director Trubnikov. President Boris Yeltsin had a "two track policy" offering commercial nuclear technology to Iran and discussing the issues with Washington. In 1991, France refunded more than $1.6 billion, while Iran remained a shareholder of Eurodif via Sofidif. However, Iran refrained from asking for the produced uranium. In 1992, Iran invited IAEA inspectors to visit all the sites and facilities they asked. Director General Blix reported that all activities observed were consistent with the peaceful use of atomic energy. The IAEA visits included undeclared facilities and Iran's nascent uranium mining project at Saghand. In the same year, Argentine officials disclosed that their country had canceled a sale to Iran of civilian nuclear equipment worth $18 million, under US pressure. In