Why is the Defense of Liechtenstein the responsibilty of Switzerland?

<h3>Why is the Defense of Liechtenstein the responsibilty of Switzerland?</h3>

just came across it and theres no place that says why.


<strong>Liechtenstein best answer:</strong>
<p><i>Answer by ? ? ? ?</i><br/>Seriously?</p>
<p><strong>Liechtenstein</strong>
<img alt="Liechtenstein" src="http://farm1.staticflickr.com/99/290042189_9e580a2422.jpg" width="400"/><br/>
<i>Image by <a href="http://www.flickr.com/photos/60374292@N00/290042189">Jean & Nathalie</a></i>
</p>

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