"pull out upon" - Translation from English to Arabic

upon their application to book a stand for the February 2013 event, they were told by sales staff that they could not allow GIH to participate in this year's exhibition due to complaints received from Greek Cypriots, who threatened to pull out of the exhibition if any TRNC firms were allowed to be present.
Upon their application to book a stand for the February 2013 event, they were told by sales staff that they could not allow GIH to participate in this year ' s exhibition due to complaints received from Greek Cypriots, who threatened to pull out of the exhibition if any TRNC firms were allowed to be present.

The international standard asserted by the United States is nothing but the special inspection that the International Atomic Energy Agency (IAEA) called for in the 1990s to infringe upon the sovereignty of the Democratic People's Republic of Korea, causing it ultimately to pull out of the Treaty on the NonProliferation of Nuclear Weapons.
إن المعيار الدولي الذي شددت عليه الولايات المتحدة ليس سوى التفتيش الخاص الذي دعت إليه الوكالة الدولية للطاقة الذرية في عام 1990 ليشكِّل تعديا على سيادة جمهورية كوريا الشعبية الديمقراطية، الأمر الذي أدى في نهاية المطاف إلى الانسحاب من معاهدة عدم انتشار الأسلحة النووية.

It is well known to the whole world that the Ethiopian Government as well as the international community have been calling upon the Eritrean Government to pull out its invading force from Ethiopian territory and instead to seek a peaceful resolution to the conflict.
ومن المعروف جيدا للعالم أجمع أن حكومة إثيوبيا والمجتمع الدولي ما فتئا يطلبان إلى حكومة اريتريا سحب قواتها الغازية من إقليم اثيوبيا والسعي بدلا من ذلك إلى حل سلمي للنزاع.