In the age of cyberspace, cybercrime has become a complex threat that cuts across national boundaries, raising unprecedented issues of global security and stability. This research considers emerging trends in cybercrime, highlighting the sophistication of attacks, the expanding involvement of state and non-state actors, and the implications of these trends for national safety. As cybercrime leverage developments in artificial intelligence, cloud computing, IoT, and cryptocurrencies, their tactics have turned more nimble, transnational, and challenging to trace. Ransomware-as-a-service, supply chain attacks, and deepfake-supported social engineering are some of the most immediate threats rewiring the cybersecurity environment. Transborder attacks, especially, illustrate the intricate confluence of technological weaknesses and geopolitics rivalries. State-sponsored cyber activities tend to obscure the distinctions between espionage, sabotage, and war, sabotaging critical infrastructure, destabilizing economies, and eroding public confidence in institutions. While criminal networks are assisted by the decentralized nature of the internet to work across borders, this makes enforcement and legal liability more difficult. These factors create gaps in current national and global legal structures, where sovereignty issues tend to conflict with the imperative for cooperation. The article contends that national security can be protected through a multi-faceted approach fusing technological resilience, sound policymaking, and international cooperation. Enhancing public-private partnerships, promoting cyber diplomacy, and developing global norms of responsible state conduct are imperative to reducing the threat of transnational cybercrime. In addition, awareness creation and capacity building at both institutional and societal levels continue to remain vital to curbing vulnerabilities. Through the examination of emerging trends and practical case studies, this research highlights the imperative of active and concerted measures in response to cybercrime. Finally, the results advocate for a move away from reactive measures and towards preventive strategies, guaranteeing that national security is maintained in an increasingly networked and uncertain cyberspace.