@schrage musik
I guess you never heard of the agreement Germany and other European countries have with the USA where the USA stores nuclear bombs/warheads to be deployed by them in case of an invasion of Europe.
So no it does not stretch belief to believe those rumours at all.
The rumour about the Saudi nuclear program and warhead sharing even spills into Wikipedia.
I'll quote some parts:
...
It is widely believed that Saudi Arabia has been a major financier of Pakistan's own integrated atomic bomb project since 1974, a programme founded by former prime minister Zulfikar Ali Bhutto.
...
In June 1998, the Prime Minister paid a farewell visit to King Fahd and publicly thanked the Saudi government for supporting the country after the tests. Shortly thereafter, Saudi Minister of Defense Prince Sultan went with Prime Minister Sharif on a tour of a classified institute, the Kahuta Research Laboratories (KRL), where leading scientist Abdul Qadeer Khan briefed the Prince and Prime Minister Sharif on nuclear physics and sensitive issues involving nuclear explosive devices.
...
Since 1998, Western diplomats and intelligence agencies have long believed that an agreement exists in which Pakistan would sell Saudi Arabia nuclear warheads and its own nuclear technology should security in the Persian Gulf deteriorate. Both countries have sharply denied the existence of such an agreement. In 2003, globalsecurity.org reported that Pakistan and Saudi Arabia had entered a secret agreement on nuclear cooperation providing Saudi Arabia with nuclear weapons technology in return for access to cheap oil for Pakistan.
Anyway this is O/T. Feel free to move this message to the appropriate thread.