Censor.NET reports referring to Council of Europe press service quoting Jagland's statement.
"I am very concerned by the decision taken today by the Court of Simferopol to declare the Mejlis of the Crimean Tatar People an "extremist organisation" and to ban it," the statement reads.
He called on the relevant authorities to take measures to reverse the decision as soon as possible.
Related materials: Reprisals in Russian-occupied Crimea
Mock trial of Akhtem Chiygoz: occupant "prosecutor" spoke discriminatory of Crimean Tatars, - attorney Polozov(0)