By Gabriela Baczynska BRUSSELS (Reuters) -The European Union on Thursday gave a final approval to its eighth batch of sanctions against Russia for its invasion of Ukraine, but said implementing a price cap on Russian seaborne oil included in the package required more work. The sanctions will block 7 billion euros ($6.9 billion) worth of Russian exports to the 27-member bloc, including steel and soap, EU officials said. They will also stop more exports from the EU, including cameras and processors, as well as blacklisting 37 more individuals and entities, including those involved in organising …