An intercontinental ballistic missile (ICBM) is a missile with a minimum range of 5,500 kilometres (3,400 mi) primarily designed for nuclear weapons delivery (delivering one or more thermonuclear warheads). ... Short and medium-range ballistic missiles are known collectively as the theatre ballistic missiles.

What was the significance of intercontinental ballistic missile?

During the Cold War, both the United States and the Soviet Union developed inter-continental ballistic missiles, known by the acronym ICBM, that were capable of reaching any target in each other's territory. ICBMs could deliver nuclear weapons in a manner that was virtually immune to defensive measures.

How many countries have intercontinental ballistic missile?

Approximately 35 countries currently possess operational ballistic missiles of various ranges and approximately 25 countries have operational cruise missiles with a range greater than 150 km (90 miles).