context of the training of the Egyptian armed forces. This was not the first time. and it will not he the last. During the presence of the aircrnft. the Sudan notified us that there were Libyan movements and concentratil>ns at the AI-Kufrah airfield. as part of a plan for acts of vil>lence within the Sudan aimed at the ovenhmw of the regime. As a result of that and in view of the presence of these aircraft. we sent them to carry out reconnaissance over the Sudanese-Libyan frontier. We established that Libya had intn>duced some of its aircntft into Egyptian airspace. and we therefore contacted the re­ sponsible Libyan authorities by telephone and requested them Ill desist from continuell viohllion of our fn>ntiers. Sl> that we should not he obliged to take measures against the invading aircrnft. The Lihy,111 uircraft did. indeed. desist. We complied with the Sudan"s request in aCCl>rdance with the Joint Defence Treaty concluded between Egypt and the Sudan. which provides for assistance between the t Wl> countries in the e,·ent of the presence of an external threat or ,,f aggressi,lll against either. DOCUMENT S/15631* Letter dated 28 February 1983 from the representative of Democratic Kampuchea to the Secretary-General I have the honour to transmit to you herewith. for your information. the statement dated :! I February 1983 hy Samdech Norodom Sihanouk. President or Democratic Kampuchea. I should he most grateful ii" you would have this '<'irculatcd under tlw doubk symbol A/38/1117-S/l)i,JI. I Original: English I French 1 I/ l\larc/1 /()831 statement circulated as an olfo.:ial document of the General Assembly and or the Security Council. · (Sii.:n<'d) T111<H'NN Prasith I', .;./1111 /1( 'II I · R < '/l/'( ',\' 1',,,111 ii'(' < !f' l>,·111, It Ttll i,' f\ <111//11/t'h,·,, 1,, th,· l '11i1,·d .\'11ti,111s ANNEX 
**Analysis**
The text appears to be a diplomatic communication between countries, discussing military actions, border incursions, and treaties. It seems to be a situation where countries are responding to perceived threats to their national security. The language used is formal and official, suggesting that it may be a document from a government or international organization.

**Category**
International relations, Defense and security