According to one Chinese historian, the Soviets and Chinese communists nearly engaged in a nuclear exchange in 1969. Bonus: it was the Nixon administration who talked them down. One of the unexpected consequences of joining the "nuclear club" is the rest of its members will make it against your best interests to use your fancy new toy to achieve your best interests. You'd think certain Persians would notice this fact but NNNOO.

Via Instapundit.