US sanctions target Putin allies

US President Barack Obama has announced further sanctions on Russian officials and a bank over the crisis in Crimea. Mr Obama also said he had signed an order enabling the US to impose sanctions on sectors of the Russian economy. Meanwhile, EU leaders have arrived in Brussels amid warnings that they may impose tougher economic sanctions. Tensions are high as Moscow approves a treaty enabling Crimea – an autonomous republic in Ukraine - to join Russia. Mr Obama said: "Russia must know that further escalation will only isolate it further from the international community." He said the US was watching with concern the situation in southern and eastern Ukraine, according to a news agency.