Ashmore Group Plc and Venezuela's government may be headed for a legal battle as a potential default on the state oil company's 2020 bonds sets off a rush to lay claim to the nation's most prized asset abroad. Ashmore, which owned about half the securities as of June 30, has urged Petroleos de Venezuela to make the $913 million payment on its 2020 notes due Oct. 28, yet the team advising National Assembly President Juan Guaido claims it doesn't have the funds, three people familiar with the matter said. What happens next is critical for Venezuela because the bonds are backed by a 50.1% stake in Citgo Holding Inc.