What is "rus-m"

Rus-M was a proposed launcher design which was intended to become Russia's main launch vehicle for crewed spaceflight after 2018, and an integral part of the Prospective Piloted Transport System which included a new manned spacecraft being developed to replace the Soyuz.

Rus-M was being developed by TsSKB-Progress, beginning in 2009. The program was halted in October 2011; "We have come to the conclusion that we do not need a new rocket, we can continue using those we already have," said Vladimir Popovkin, head of Russia's space agency, according to the Novosti news agency.