RD-0213 is the main-engine component of KBKhA's RD-0212 integrated Proton third-stage propulsion block. KBKhA documents one RD-0213 paired with one RD-0214 steering engine and identifies the block's nitrogen-tetroxide/UDMH propellant pair; this component record keeps the exact main-engine identity while leaving standalone performance and current lifecycle unknown.