The energy-rich Central Asian nation of Turkmenistan said today that it has restricted natural gas deliveries to Iran over unpaid debts. Turkmenistan's foreign ministry said that its ability to maintain its gas transportation infrastructure has been compromised by Iran's failure to continue paying off old debts since 2013.<br/>'<br/>The Turkmen government has not specified the size of Iran's outstanding debts, although Iranian state media have put the figure demanded by Turkmenistan at around 2 billion US dollar. Turkmenistan said, it pleaded with Iran for the past year to resolve the debt arrears but received no response.<br/>