 The successor launch vehicle of Ariane 5, the Ariane 6, is under development and is envisioned to enter service in the 2020s.The beginning of the new millennium saw ESA become, along with agencies like NASA, JAXA, ISRO, the CSA and Roscosmos, one of the major participants in scientific space research.Although ESA had relied on co-operation with NASA in previous decades, especially the 1990s, changed circumstances (such as tough legal restrictions on information sharing by the United States military) led to decisions to rely more on itself and on co-operation with Russia.