G7 leaders say Russia will face further economic sanctions if it continues to support rebels in Ukraine. The group of leading industrialised nations said Russia had undermined Ukraine's sovereignty, territorial integrity and independence. The warning came after the European Union added eight more Russians to its sanctions. The G7 group of economic powers includes the United States, Japan, Germany, Britain, France, Italy and Canada. Its leaders said Russia could still choose the path of de-escalation, but warned President Vladimir Putin that he would face greater economic costs if he continued to back Ukrainian separatists. The leaders also called on all sides to establish a ceasefire at the crash site of the Malaysian Airlines jet in eastern Ukraine.Earlier, Russia described new US and EU sanctions as destructive and short sighted and said they would lead to higher energy prices in Europe.