and armed with four R-40 air-to-air missiles. NATO designation Foxbat-A. MiG-25PD Improved single-seat all-weather interceptor fighter aircraft, which entered service from 1979. Fitted with R-15BD-300 engines and new N-005 Saphir-25 (RP-25M) Pulse-Doppler radar with look-down/shoot down capability, based on the radar of the MiG-23ML. Could be fitted with four R-60 air-to-air missiles replacing outermost two R-40 missiles. Late examples fitted with an undernose IRST. NATO designation Foxbat-E. MiG-25PDS Upgrade of surviving MiG-25Ps to MiG-25PD standard from 1979. NATO designation Foxbat-E. MiG-25PDSL Single MiG-25PD modified by addition of electronic countermeasures (ECM) equipment. MiG-25PDZ Single MiG-25PD modified with retractable in-flight refuelling probe. MiG-25M Two testbeds (one converted from a MiG-25RB and one from a MiG-25PD) for more powerful ( dry, with afterburner) engines. Ye-266M Designation applied to MiG-25M when used for record breaking in 1975 and 1977, including setting an absolute altitude record for a jet aircraft of on 31 August 1977. Izdelye 99 Two aircraft used as testbeds for Soloviev D-30F turbofan as later used in MiG-31. Reconnaissance and strike versions MiG-25R Single-seat high-altitude daylight reconnaissance aircraft, fitted with cameras and ELINT equipment. NATO codename Foxbat-B. MiG-25RB Single-seat reconnaissance-bomber derivative of MiG-25R, fitted with improved reconnaissance systems and a Peleng automatic bombing system. The aircraft can carry a bombload of eight bombs. Entered service in 1970. NATO codename Foxbat-B. MiG-25RBV Modernised single-seat reconnaissance-bomber with revised ELINT equipment (SRS-9 Virazh). NATO codename Foxbat-B. MiG-25RBT Further improved reconnaissance-bomber, with Tangazh ELINT equipment. NATO codename Foxbat-B. MiG-25RBN Dedicated night reconnaissance aircraft, carrying 10 photoflash bombs under the fuselage. Only single prototype built. NATO codename Foxbat-B. MiG-25RR Conversion of eight reconnaissance aircraft for high-altitude radiation sampling role. Used to monitor Chinese nuclear tests between 1970 and 1980. NATO codename Foxbat-B. MiG-25RBK Single-seat dedicated ELINT aircraft, with Kub-3K ELINT system. Bombing capability retained but cameras not fitted. NATO codename Foxbat-D. MiG-25RBF Conversion of MiG-25RBK with new Shar-25 ELINT equipment. NATO codename Foxbat-D. MiG-25RBS Single-seat radar-reconnaissance aircraft, with Sablya-E side looking airborne radar (SLAR). Cameras not fitted but bombing capability retained. NATO codename Foxbat-D. MiG-25RBSh MiG-25RBS fitted with more capable Shompol SLAR. NATO codename Foxbat-D. MiG-25BM "Foxbat-F" Single-seat defence-suppression aircraft, armed with Kh-58 or Kh-31 air-to-surface missiles. Conversion trainers MiG-25PU Two-seat conversion trainer for MiG-25P interceptors. Fitted with a new nose section with two separate cockpits. It has no radar and no combat capability. NATO codename Foxbat-C. MiG-25RU Two-seat conversion trainer for reconnaissance versions. Fitted with MiG-25R