5. China
Number of warheads: Unknown, suspected 260
Delivery method: nuclear triad
The majority of the Chinese nuclear arsenal is stored in vast underground facilities, the so-called Great Chinese Nuclear Wall. The estimates cite that these tunnels occupy as much as 3,000 miles. In addition to this complex, China, the number 5 in our list of countries with nukes, has a fleet of Xian H6 bombers, a Chinese-built version of Soviet Tu-16 as an air delivery component for its nuclear weapons. Chinese nuclear triad is completed with Type 092 and type 094 submarines, capable of delivering JL-1 and JL-2 SLBMs (submarine-launched ballistic missile) to targets as far as 7,200 km.