This bill, titled the Northern Border Security Enhancement and Review Act, significantly amends the existing Northern Border Security Review Act by establishing recurring requirements for threat assessments and strategic planning. It mandates that the Department of Homeland Security (DHS) conduct a comprehensive Northern Border Threat Analysis every three years, starting September 2, 2025, which must include an assessment of recent changes in apprehension amounts and demographics at the sector level. Furthermore, DHS is required to update its Northern Border Strategy every five years, beginning September 2, 2026, incorporating the findings from the most recent threat analysis. The legislation also introduces new oversight mechanisms, requiring the Secretary of Homeland Security to provide classified briefings to appropriate congressional committees within 30 days of each threat analysis submission. Additionally, it directs DHS, through U.S. Customs and Border Protection's Air and Marine Operations, to develop performance measures within 180 days to assess the effectiveness of securing the northern border in air and maritime environments, addressing Government Accountability Office recommendations. Notably, the bill specifies that no additional funds are authorized for its implementation.