By Sabine Siebold and Ingrid Melander BRUSSELS (Reuters) -European Union leaders on Thursday granted Ukraine the coveted status of official candidate to join their 27-nation club, a bold geopolitical step hailed by Kyiv and the EU itself as a “historic moment”. Although it could take Ukraine more than a decade to eventually join the bloc, the decision to officially accept it as a candidate is a symbol of the EU’s intention to reach deep into the former Soviet Union. “The Ukrainian people belong to the European family. Ukraine’s future is with the EU,” the bloc’s foreign policy chief Josep Borr…