The Warsaw Pact has about 4,000 intermediate range nuclear weapons, while the equivalent NATO total is under 1,000. Although these figures for weapons systems have remained fairly constant for the last few years, the figure for actual warheads has shown a marked increase for the Warsaw Pact. Since 1977 the number of Soviet warheads on systems targeted on western Europe has increased by over 700 with the deployment of the SS20 missile. NATO has no comparable system and the planned NATO modernisation programme will entail no increase in NATO warhead numbers.