The "Talk" page of the European Journal of International Law (EJIL), directed by Prof. Marko Milanovic (Nottingham University), published a post of Matteo Vaccaro-Incisa briefly commenting on certain aspects of the recent jurisdictional decisions in the investment arbitration proceedings pitting Ukrainian investors against Russia for their investments made in Crimea prior to the ‘change of effective sovereign’ the peninsula went through in February-March 2014. The short analysis follows on April 2017 publication of Matteo Vaccaro-Incisa on the public international law issue of Crimea’s change of sovereign, and January 2018 speaking engagement at ICC YAF Frankfurt on the review of year 2017 of developments in investment law and arbitration.