Talks to form a new Greek government appeared near collapse Sunday after the leader of a left-wing party that favors rejecting Greece’s loan agreement with foreign creditors again refused to join a unity coalition, making new elections almost a given. President Karolos Papoulias met with the leaders of several smaller parties Sunday evening but the meeting ended without agreement on a two-year unity government with the Socialists and the center-right New Democracy Party. The ruling parties are seeking to form a coalition that would allow them to enforce the loan agreement, but with a possible renegotiation of some terms.