[Greek PM Tsipras attends a parliamentary session before a vote for an omnibus bill cutting spending on pensions, speed up privatisations and reform the electricity market, in Athens]Greece on Friday accused neighbouring Turkey of endangering ties between the two NATO allies by questioning the wisdom of an almost century-old treaty that established the modern boundaries between the two countries. At a speech in Ankara on Thursday, Turkish President Tayyip Erdogan said the Treaty of Lausanne, a 1923 peace accord which forged modern Greece and Turkey's borders, was essentially a defeat for Turkey because it "gave away" islands to Greece. Ties between Greece and Turkey have suffered strains over the years, because of squabbles over sea boundaries between the two countries and because of divided Cyprus, ethnically split between its Greek and Turkish Cypriot populations since 1974.