be even stronger efforts to curb the vertical p"ollferation of nuclear veapons. The world conmunity has discovered that the problem of horizontaf proliferation invol-ves difficulties ccmparable to those of vertical non-prol-i ferat ion. There are qucstions of energy security, transfer ol technology and nuclear safeguards, co give just some examples. The attitude of those nuclear-weapon States which erphasize only horizontal non-pro]i feration while rcsorting to politicaf and rnilitary "realities" as excuses for the slow pace of curbing the nuclear arns race does not contribute to the cause of mutual confidence-buildinn r,rithin the internationaf conmunity. !I7. The success of negotiations on the reduction of nuclear rreapons in a regional context rnay sometimes depend on the success of the bilateral efforts of the two supex-Powers and their aIIies. But, increasingly, the relaticnship betveen strategic, rrtheatre" and tactical nuclear rreapons 1,ri11 need to be taken into account if significant prog"ess is to be made towards the goal of nucleaf d.isarmament. In many cases, the reduction of nuclear wcapons wil-l- require that regional security conditions be tahen into account. Among these, the size and military pover of the various States and groups of States concerned lrould form ai i _1> i3)2 Annex relevant factor. Thus, in some cases F- regional approach may be fo11o',red,indcpend:ntly of or in paraI1el with a bilateral one, 518, However, regional situations vary. fn certain areas nuclear lreapons are dep1oyed on the territories of nuclear-veapon States as wel_l as non-nuclear-, weaFon states allied to Lhe nuclear Povers. Nuclear weapons are also delloyecl cnsurface ships and subnarines in various sea a?eas adJ acent bath to areas vhere
**Analysis**
The text appears to be discussing the proliferation of nuclear weapons and the challenges of reducing the number of nuclear arms. The language used is formal and diplomatic, suggesting that the text is related to international relations and security issues. The text also mentions regional security conditions and the military power of various states, which further supports the idea that the topic is related to international relations and security.

**Category**
International relations, Science and technology