CN Europe Key Research: ••• MS upgrades RIO LN, Exane downgrades EKTAB SS, Kepler initiates NHY NO (b) & SIK VX (reduce) •••• Commerzbank upgrades MRK GY, Barclays strategy downgrades EM & upgrades Japan, Natixis downgrades IAM FP ••• Barclays reinstates ELPE GA (ew), Berenberg downgrades TATE LN, Bof