Just remember Seimens (a German company) has sold nuclear tech to Iran.
The Iranian nuclear program was actually started by the US "Atoms for Peace" program, Siemens (actually KWU which was part of Siemens at that time) was a major supplier for the Busher programme which was cancelled - ironically - by Khomeini who thought all weapons of mass destruction as un-islamic. The contracts were terminated with the islamic revolution in 79 and the Russian government (via Rosatom) helped build that reactor and other nuclear facilities. A lot of western companies did supply parts for that, not only Germans but also american companies since many contracts went through Rosatom puppets.
I have no problem with what Bush and then Obama did.
And if Seimens were to sell to North Korea, I say we start bombing.
The French supplied Pakistan with the technology (CEA), the US helped the Indian program (notably with Uranium and Thorium delivered by the Bush administration), so go and bomb France and your hometown...