Renewed Great Power Competition: Implications for Defense--Issues for Congress [Updated January 31, 2020] [open pdf - 1MB]
From the Summary: "Many observers have concluded that the post-Cold War era of international relations--which began in the early 1990s and is sometimes referred to as the unipolar moment (with the United States as the unipolar power)--began to fade in 2006-2008, and that by 2014, the international environment had shifted to a fundamentally different situation of renewed great power competition with China and Russia and challenges by these two countries and others to elements of the U.S.-led international order that has operated since World War II. [...] The issue for Congress is how U.S. defense planning should respond to this shift, and whether to approve, reject, or modify the Trump Administration's proposed defense funding levels, strategy, plans, and programs for responding to this shift. Congress's decisions on these issues could have significant or even profound implications for U.S. defense capabilities and funding requirements."
CRS Report for Congress, R43838
Congressional Research Service: https://crsreports.congress.gov/