70Lastly, it should be borne in mind that, since the right to freedom of movement is – as a fundamental principle of EU law – the general rule, the conditions laid down in Article 7(1)(b) of Directive 2004/38 must be construed narrowly (see, by analogy, Kamberaj, paragraph 86, and Chakroun, paragraph 43) and in compliance with the limits imposed by EU law and the principle of proportionality (see Baumbast and R, paragraph 91; Zhu and Chen, paragraph 32; and Commission v Belgium, paragraph 39).
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