By Gabriela Baczynska and Marine Strauss BRUSSELS (Reuters) – European Union leaders said on Thursday they would slap harsh new sanctions on Russia over its invasion of Ukraine, targetting Russia elites and hitting its economy hard. The new sanctions will include freezing Russian assets in the 27-nation bloc, halting banks’ access to European financial markets and hitting “Kremlin interests”. The bloc will also target Russia’s trade, energy and transport, among other sectors, and include export controls, in what the EU’s foreign policy chief, Josep Borrell described as “the harshest package of…