* MSCI Asia ex-Japan +0.07%* Falling bond yields point to continued risk aversion -analyst* Brent crude drops below $70 per barrel after rally* Asian stock markets: https://tmsnrt.rs/2zpUAr4By Andrew GalbraithSHANGHAI, May 28 (Reuters) - Asian shares tracked European gains on Tuesday, as relief over EU election results eased concerns about political difficulties in the bloc and merger news support