ATHENS (Reuters) – Greece said on Saturday that six Greek nationals had been killed and six others wounded by Russian bombing near Mariupol in Ukraine, and that it had summoned Russia’s ambassador to the foreign ministry on Monday after a verbal demarche. The bombing took place in the outskirts of Sartana and Bugas villages and one of those injured was a child, the foreign ministry said. “The death of our nationals creates grief and anger for this unacceptable Russian attack against civilians,” Prime Minister Kyriakos Mitsotakis said in a statement. The foreign ministry condemned the continuin…