3. Calls upon all the parties concerned to continue to co-operate with the Force on the basis of the present mandate.
Adopted unanimously at the 2f!98th meeting.
Decision
At the same meeting, the President made the following statement on behalf of the members of the Council:85
"The members of the Security Council take note of the Secretary-General's rcport82 on the United Nations operation in Cyprus and express their full support for his continuing efforts in pursuing the mitiative launched in August 1988.
"The members of the Council recall the statement made on their behalf by the President ofthe Council on 9 June 1989,82 in which they expressed their regret that, in the more than 25 years since the establishment of the United Nations Peace-keeping Force in Cyprus, it had not been possible to achieve a negotiated settlement of all aspects of the Cyprus problem.
"The members of the Council note the SecretaryGeneral's assessment that a basis for effective negotiations exists provided both leaders manifest the necessary good will and recognize that a viable solution must satisfy the legitimate interests of both communities.
85 S/21026.

"The members of the Council share the SecretaryGeneral's disappointment that it has not been possible to achieve concrete results to date in developing an agreed outline of an overall agreement. In this regard, they share the Secretary-General's hope that direct and meaningful talks can be resumed early next year.
"The members of the Council urge both leaders to proceed as suggested by the Secretary-General durmg their most recent meetings and, as agreed in June, to co-operate with him and his Special Representative in completing work on an outline. They also urge the two parties to make a further determined effort to promote reconciliation. They share the SecretaryGeneral's view that the adoption of good will measures could prove useful in this regard.
"The members of the Council are concerned about the difficulties encountered by the Force during the last mandate period. They call on all parties to co-opcrate with the Force and to take effective measures to ensure that the integrity of the buffer zone is safeguarded.
"The members of the Council also note the continuing financial difficulties facing the Force as indicated by the Secretary-General. They take note of his appeal for greater financial contributions to the Force, which would help it continue its important peace-keeping role in Cyprus and would reduce its financial difficult ics.
"The members of the Council request the Secretary-General to report back to the Council by 1 March 1990 on what progress has been made in resuming intensive talks and developing an agreed outline of an overall agreement."

MARKING OF PLASTIC OR SHEET EXPLOSIVES FOR TilE PURPOSE OF DETECTION

Decision
At its 2869th meeting, on 14 June 1989, the Council discussed the item entitled "Marking of plastic or sheet explosives for the purpose of detection".
Resolution 635 (1989)
or 14 Jun~ 1989

Concerned about the case with which plastic or sheet explosives can be used in acts of terrorism with little risk of detection,
Taking note of the International Civil Aviation Organization Council resolution of 16 February 1989, in which it urged its member States to expedite current research and development on detection of explosives and on security equipment,
l. Condemns all acts of unlawful interference against the security of civil aviation;

The Security Council,
Conscious of the implications of acts of terrorism for international security,
Deeply concerned by all acts of unlawful interference against international civil aviation,
Mindful of the important role of the United Nations in supporting and encouraging efforts by all States and intergovernmental organizations in preventing and eliminating all acts of tcrrori~m, including tho~c involv ing the use of explosives,
Determined to encourage the promotion of effective measures to prevent acts of terrorism,

2. Calls upon all States to co-operate in devising and implementing measures to prevent all acts of terrorism, including those involving explosives;
3. Welcomes the work already undertaken by the International Civil Aviation Organization, and by other international organizations, aimed at preventing and eliminating all acts of terrorism, in particular in the field of aviation ~ecurity;
4. Urges the International Civil Aviation Organization to intensify it' work aimed at preventing all acts of tcrwri~m again<;~ international civil aviation, and in p;ut icu)aJ its kW(l! ()fl devising an international regime l(lr the marking of plastic or sheet explosives for the purpose of detection;

IX

5. Urges all States, and in particular the producers of plastic or sheet explosives, to intensify research into means of making such explosives more easily detectable, and to co-operate in this endeavour;
6. Calls upon all States to share the results of such research and co-operation with a view to devising, in the

International Civil Aviation Organization and other competent international orgamzations, an international regime for the marking of plastic or sheet explosives for the purpose of detection.
Adopted unanimously at the 2869th meeting.

CENTRAL AMERICA: EFFORTS TOWARDS PEACE

Decision
At its 2871st meeting, on 27 July 1989, the Council discussed the item entitled "Central America: efforts towards peace".
Resolution 637 (1989)
of 27 July 1989
The Security Council,
Recalling its resolutions 530 (1983) of 19 May 1983 and 562 (1985) of 10 May 1985 and General Assembly resolutions 38/10 of 11 November 1983, 39/4 of 26 October 1984,41/37 of 18 November 1986,42/1 of7 October 1987 and 43/24 of 15 November 1988, as well as the initiative that the Secretary-General of the United Nations undertook on 18 November 1986 together with the Secretary General of the Organization of American States,
Convinced that the peoples of Central America wish to achieve a peaceful settlement of their conflicts without outside interference, including support for irregular forces, with respect for the principles of self-determination and non-intervention while ensuring full respect for human rights,
Taking note of the report of the Secretary-General of 26 June 1989 submitted in pursuance of Security Council resolutions 530 (1983) and 562 (1985),86
Recognizing the important contribution of the Contadora Group and its Support Group in favour of peace in Central America,
Welcoming the agreement on "Procedures for the establishment of a firm and lasting peace in Central America" signed at Guatemala City on 7 August 1987 by the Presidents of the Republics of Costa Rica, El Salvador, Guatemala, Honduras and Nicaragua87 as the manifestation of the will of the peoples of Central America to achieve peace, democratization, reconciliation, development and justice, in accordance with their decision to meet the historical challenge of forging a peaceful destiny for the region,
Welcoming also the subsequent Joint Declarations issued by the Central American Presidents on 16 Janu-
86 Official Records of the Security Council, Forty-fourth Year, Supplement for April, May and June 1989, document S/20699.
87 Ibid., Forty-second Year, Supplement for July, August and September 1987, document S/19085, annex.

ary 1988 at Alajuela, Costa Rica88 and on 14 February 1989 at Costa del Sol, El Salvador,89
Aware of the importance which the Central American Presidents attach to the role of international verification as an.essential component for the implementation of the above-mentioned instruments, including, in particular, their commitments relating to regional security, especially non-use of territory to support destabilization of neighbouring countries, and democratization, especially free and fair elections, as well as to the voluntary demobilization, repatriation or relocation of irregular forces, as agreed in the Costa del Sol accord of 14 February 1989,
Aware also that the commitments enshrined in the Guatemala agreement 87 form a harmonious and indivisible whole,
Noting with appreciation the efforts undertaken to date by the Secretary-General in support of the Central American peace process, including his assistance in the establishment of appropriate mechanisms to verify compliance with the provtsions ofthe Guatemala agreement and of the Joint Declaration adopted by the Central American Presidents at their meeting held in El Salvador on 14 February 1989,89 and particularly the Secretary-General's agreement with Nicaragua to deploy a United Nations observer mission to verify the electoral process,
1. Commends the desire for peace expressed by the Central American Presidents in signing on 7 August 1987 at Guatemala City the agreement on "Procedures for the establishment of a firm and lasting peace in Central America" 87 and in the Joint DeclaratiOns subsequently signed in pursuance of it;
2. Expresses its firmest support for the Guatemala agreement and the Joint Declarations;
3. Calls upon the Presidents to continue their efforts to achieve a firm and lasting peace in Central America through the faithful implementation of the commitments entered into in the Guatemala agreement and in the expressions of good will contained in the Joint Declaration of 14 February 1989;
4. Appeals to all States, in particular to those which have links with the region and mterests in it, to back the political will of the Central American countries to comply with the provisions of the Guatemala agreement and of the Joint Declaration, particularly that regional and extra-regional Governments which either openly or eo-
88 Ibid., Forty-third Year, Supplement for January, February and March J9R8, document S/]9447, annex.
RQ Ibid., Forty fourth }'car, Supplement for January, February and March 1989, document S/20491, annex.

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