YEREVAN, JANUARY 17, ARMENPRESS. The United States is gravely concerned that the Lachin corridor has now been obstructed for more than 30 days, creating critical shortages of food, medicine, and other supplies in Nagorno-Karabakh, “these facts are indisputable,” the United States Ambassador to the OSCE Michael Carpenter said at the Special Permanent Council in Vienna in response to Armenian Foreign Minister Ararat Mirzoyan’s remarks.