By Alexander Ratz and John Irish WEISSENHAUS, Germany (Reuters) – Foreign ministers from the G7 group of rich nations backed giving more aid and weapons to Ukraine as they met on Friday in what Germany called a “powerful sign of unity” to deepen Russia’s global isolation for invading its neighbour. The European Union’s foreign policy chief Josep Borrell announced a further 500 million euros worth of military support that should be approved next week by EU members, and expressed confidence that the bloc will agree an embargo on Russian oil. British Foreign Minister Liz Truss announced new sanct…