Human practices in new strategic domains, such as outer space and cyberspace, have demonstrated both novelty and complexity, which pose new challenges for the effective interpretation of issues with traditional theories of international relations. Academic arguments over political meaning of new strategic domains are still enlarging. To explain the variety and complexity of state security behaviors in new strategic domains, a perspective from international system is needed. This paper aims to establish a theoretical framework that explains the dynamic interaction between international system and security in new strategic domains. It focuses on the environmental characters, power mechanisms and practice logics in outer space and cyberspace. Such a social process from environmental settings to agent-level practices is constantly interwoven with, influenced by, and simultaneously shaping the international system. This analytic framework aims to provide a new perspective and theoretical foundation for maintaining security in new strategic domains as well as stability in the international system.

Coastal states are entitled to certain sovereign rights and jurisdictions in the EEZ according to the UNCLOS, which also prescribes the freedom of navigation for non-coastal states. Theoretically, there is no substantial conflict between the jurisdiction of coastal states to ensure maritime security and the freedom of navigation of noncoastal states. Nevertheless, for the maintenances of its maritime hegemony, the US implements the Freedom of Navigation (FON) program in China's EEZ actively and arbitrarily, which threats the maritime security and freedom of navigation in the EEZ concerned. Jurisprudential study of the relationship between maritime security and freedom of navigation indicates the freedom of navigation in the waters beyond the high sea is not absolute and its relativity or restrictions emanate from the international obligations to take into account the security of coastal states. The comparative study of the freedom of navigation of different categories of ships as well as the freedom in different marine zones demonstrates that the freedom of warship in the EEZ should not prejudice the security of coastal states, especially the nontraditional security of the sea. The Sino-US conflicts in the USNS Impeccable and American Unmanned Underwater Vehicle（UUV）incidents in the SCS are the expressions of the US cost imposition strategy against China. The empirical analysis of such conflicts suggests that the freedom of US warships in China's EEZ and their related activities therein should be subject to the jurisdiction of the coastal state for the purpose of maritime security.

The circumnavigation of Magellan from 1519 to 1522 lasted for three years, covering almost 80 thousands kilometers. The circumnavigation can be divided into six big sections, namely the section of the Atlantic, of the Strait of Magellan, of the Pacific, of the South-east Asia, of the Indian Ocean, and of the Atlantic. The section of the Pacific is the most difficult, dangerous and critical one in the circumnavigation, but also a section of the greatest achievement in discovery, of the most far-reaching influence, of the most issues, and of the most complex controversies. The success of such a voyage crossing the Pacific verified its area preliminarily, discovered some islands uninhabited and inhabited. Under the circumstance that Christopher Columbus had made a voyage to America, Vasco da Gama and other Portuguese had made a voyage around India, and there had been communications between India and the South-east Asia for a long time, Magellan's circumnavigation connects the most critical and significant link in the network of global navigation. A heavy price has been paid and about 20 people in Magellan's fleet died of disease and hungry in the course of the voyage crossing the Pacific. However, their overreaction and cruel behaviors in Guam brought disgrace to the voyage, making an indelible stain of the circumnavigation. Nevertheless, records concerning inhabitants of the Pacific islands have become precious materials for the study of ethnology and anthropology.

Some countries in the Latin American and Caribbean region start the process to coordinate thedevelopment of the Belt and Road Initiative. President Xi Jinping proposes that, the region makes the natural extension of the 21st Century Maritime Silk Road, and the regional countries are indispensable participant in the construction of the Belt and Road Initiative. Focusing on transportation, energy and communication, the region is accelerating the process of regional interconnection, which aligns with the facilities connectivity in the framework of the Belt and Road Initiative. Initiative for Regional Infrastructure Integration in South America (IIRSA), Project for Integration and Development in Mesoamerican (PM), and Petro-Caribe are 3 rather important sub-regional cooperation mechanisms for interconnection, and the projects can beclassified into 3 levels: the domestic interconnection, the sub-regional interconnection, and the inter-continental interconnection. China-CELAC Forum provides an important platform to deepen the comprehensive cooperation partnership of China and the region, and to promote comprehensive cooperation. By virtue of the platform, both sides should take the interconnection as the priority area, the 3 levels interconnection as the bases, and the 10 bi-oceanic corridors as the crucial projects, so as to establish the diversified, multi-level mechanisms for the joint construction of the Belt and Road Initiative.

Economic sanction is one of the most favored policy options of America. Most of the world's economic sanctions also are imposed by America. China has often been sanctioned by America. What signals are America's economic sanctions used for? Supporters for effective sanctions argue that economic sanctions are used for signaling resolve; others contribute economic sanctions to symbolic signals. Based on an analytical framework, this paper proposes that economic sanctions are used for three kinds of signals: resolve, symbolism and bargaining. Then this paper discusses that: for resolve, the sanction state would threaten the target state and fulfill its commitments; for symbolism, the sanction state would avoid substantial sanctions on critical fields of the target, or avoid continuing to impose more severe economic sanctions; for bargaining, the sanction state would link other claims to the revocation of economic sanctions.

It is called at the 19th national congress of the Chinese Communist Party that our party must undertake a great struggle with many new contemporary features. Such an assessment originates from basic approaches of Marxism, materialism and dialectics. A man needs to think, and he should feed himself in the first place, which makes the prerequisite instead of the result of thinking. To feed himself, the man has to struggle for the interest distribution, either in the name of a certain nation or class, which makes the struggle to be the principle aspect of contradictions, and the essence of phenomena. Great struggles called for dialectics, as well as materialism. Materialism specifies boundaries of behaviors, while dialectics balances relationship between life and death. A review of history reveals that more states are overthrew by excessive expansion rather than enemy􀆳s invasion. Since, as the Chinese saying goes, the last leg of a journey just marks the halfway point, we must have a good command of basic approaches of Marxist dialectical materialism to comprehend and remake the world.