Police cooperation across national and international borders is increasingly important, given the greater interaction between national police services in the course of dealing with transnational crime and their role in international peacekeeping and in relation to natural disasters. A number of trends signal a greater movement toward global systems of law enforcement: the negotiation of bilateral and multilateral law-enforcement agreements, the inclusion of foreign police agents in training programs, the stationing of liaison officers in foreign countries, and further development of transnational police organizations at both regional and wider international levels.