The RT-20P was a mobile ICBM consisting on a unusual combination of a solid-fueled first stage and a liquid-fueled (N2O2 / UDMH) second stage.
After 12 (other sources: 8) flight tests from Plesetsk, the development was cancelled. It had a range of 5000 km with an heavy warhead to 7000 km with a light warhead.
|Vehicle||Stage 1||Stage 2|
|RT-20P (8K99)||15D151||8K94 / RD-857 (15D12)|