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The Contracting States have the right as a matter of international law and subject to their treaty obligations, including the Convention, to control the entry, residence and expulsion of aliens (see, inter alia, Üner v. the Netherlands [GC], no. 46410/99, § 54, ECHR 2006-XII; Abdulaziz, Cabales and Balkandali v. the United Kingdom, 28 May 1985, § 67, Series A no. 94; and Boujlifa v. France, 21 October 1997, § 42, Reports of Judgments and Decisions 1997-VI).

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The fact that the applicant's circumstances, including his life expectancy, would be significantly reduced if he were to be removed from the Contracting State is not sufficient in itself to give rise to a breach of Article 3. The decision to remove an alien who is suffering from a serious mental or physical illness to a country where the facilities for the treatment of that illness are inferior to those available in the Contracting State may raise an issue under Article 3, but only in a very exceptional case where the humanitarian grounds against the removal are compelling (N. v. the United Kingdom [GC], no. 26565/05, § 42, ECHR 2008).

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These standards imply that the ill-treatment the applicant alleges he will face if returned must attain a minimum level of severity if it is to fall within the scope of Article 3. The assessment of this is relative, depending on all the circumstances of the case (Hilal v. the United Kingdom, no. 45276/99, § 60, ECHR 2001-II).