The Achmea Case https://www.italaw.com/cases/417

John P Gaffney,‘Slovak Republic v. Achmea: A Disproportionate Judgment?’, 14 September 2018
http://arbitrationblog.kluwerarbitration.com/2018/09/14/slovak-republic-v-achmea-a-disproportionate-judgment/

See also the Ioan Micula and Others v Romania case (ICSID Case No ARB/05/20, final award 11 December 2013)

As to judicial developments after the 2013 ICSID award on the Micula case, see https://www.italaw.com/cases/697