Politics‘On the brink’: Oil prices rise as Russia sends troops into UkraineEmergency UN Security Council meeting called as Russia sends troops into eastern Ukraine on 'peacekeeping' duties, a move set to bring sanctions from the WestTension: Russian President Vladimir Putin addresses the nation, recognising the independence of separatist regions in eastern Ukraine, raising tensions with WestPhoto: AP/SCANPIXJosh LewisPerth