Country |
Year of First Fission Explosion |
Year of First Fusion Explosion |
Number of Warheads |
| United States | 1945 |
1956 |
900* |
| France | 1947 |
1955 |
237 |
| Soviet Union (Siberia) | 1949 |
1958 |
1 100* |
| Argentina | 1951 |
1966 |
69 |
| United Kingdom | 1954 |
1957 |
189 |
| Brazil | 1958 |
- |
85 |
| Japan | 1959 |
- |
220* |
| China | 1964 |
1968 |
60* |
| India | 1971 |
- |
5* |
* Estimated
| Country | Minimum Time for Construction (years) |
| Australia | 4 |
| Canada | 10 |
| Chile | 2 |
| Czechoslovakia | 2 |
| Denmark | 6 |
| Egypt | 2 |
| Germany | 2 |
| Greece | 6 |
| Hungary | 6 |
| Indonesia | 10 |
| Iran | 10 |
| Korea | 10 |
| Mexico | 10 |
| Netherlands | 6 |
| Norway | 10 |
| Pakistan | 4 |
| Poland | 6 |
| South Africa | 6 |
| Sweden | 2 |
| Venezuela | 4 |