Research on the patterns of international migration, along with the economic, social, and cultural transformations resulting from the reorientation of regional migration flows in the 21st century, is of paramount relevance for countries actively modernizing their migration policies. This article aims to identify the fundamental regularities of migration dynamics in both donor and recipient countries, based on an assessment of the macroeconomic impact of international migration over the period from 1990 to 2020. The study utilized quantitative measurement methods from organizations such as the World Bank, the United Nations, the International Organization for Migration, the Organization for Economic Co-operation and Development, along with analytical and statistical information. The research reveals that recent migration flows consist of a combination of enduring trends, despite obstacles imposed by the COVID-19 pandemic, which are anticipated to strengthen in the coming decades, as well as sporadic surges triggered by crises and natural disasters. Various demographic trends, climate-induced stressors, transformative technologies, and growing inequalities within and between countries serve as driving forces in contemporary international migration. Simultaneously, violence, conflicts, and despair have led to sudden and substantial population movements, including those from Syria, South Sudan, Myanmar, Venezuela, and more recently, Ukraine. The findings emphasize the complexity and unpredictability of international migration dynamics. However, the ever-expanding and improving data and information resources may enhance our understanding of the critical aspects of migration in increasingly uncertain times. The primary research findings, which offer scientific novelty, introduce a fundamentally new approach to comprehending the role of factors regulating migration processes. The practical significance of the results lies in the development of recommendations and proposals that can be useful in shaping and implementing national migration policies.