Always ask for approval when considering an internship.

ETH Zürich, center for security studies 
University ETH Zürich has many different internships every year in the area of security and international relations. These internships are for students as well as graduates and take in Zürich. Here, the intern will, for example, help an senior researcher or contribute to another project. 
More information about the internships, like duration and the application procedure, can be found on the website linked above.

The Hague Centre for Strategic Studies 
The Hague centre for strategic studies has various internships every year, which often last up to six months and are paid. These internships are in various areas, such as PR & Communication or Data analyse. 
More information about the internships, like duration and the application procedure, can be found on the website linked above.
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Duitsland Instituut Amsterdam 
The Hague Institute for Global Justice