Wars between states—particularly protracted, high-intensity conflicts (such as the Russia-Ukraine war), which involve the commitment of significant resources—have the capacity to reshape how states fight by providing both the opportunity and the pressure to use and adapt novel capabilities. In this report, the authors closely examine the tactical and operational levels of the fighting in Ukraine to make eight novel or notable observations about contemporary warfighting. These observations include insights about the use of uncrewed aerial and naval systems in combat, the transparent battlefield and the problem of persistent surveillance, the effectiveness of air defenses and electronic warfare against uncrewed systems, the need for low-cost expendable systems in a protracted conflict, the accessibility of commercial space-based assets for military purposes. The authors also use these observations to forecast the character of future wars by evaluating whether and how their observations might translate to two potential U.S.-involved conflict scenarios: a war in Eastern Europe between North Atlantic Treaty Organization members and Russia and a war in the Indo-Pacific between the United States and the People’s Republic of China. The authors conclude by highlighting the implications of their observations and providing recommendations for the Department of the Air Force, the Department of Defense, and U.S. government policymakers.

Ensuring military access to the territory of allies and partners in the Indo-Pacific in the event of a future conflict with China is a critical concern for U.S. policymakers. The physical and political geography of the region sharply limits U.S. options to such an extent that some allied and partner decisions to provide or refuse access could determine the outcome of a conflict. A clearer understanding of how and why U.S. allies and partners are likely to make conflict-phase access decisions, and what U.S. policymakers can do to affect the decisions ahead of time, is therefore essential. In this report, the authors examine how U.S. allies and partners make conflict-phase access decisions and how the United States and the U.S. Air Force (USAF) might be able to influence decisions in advance. The authors developed a framework for assessing such decisionmaking, then applied it to five specific allies and partners in the region (Japan, the Philippines, Singapore, Indonesia, and India) to assess their strategic outlooks, internal politics, and economic incentives and to identify the peacetime policy levers that are most promising for affecting the states' decisionmaking.