The United States’ decision to significantly reduce its military footprint in Southeast Europe represents a pivotal shift in American foreign and defense policy. In October 2025, the Pentagon announced the termination of the rotational deployment of a brigade from the 101st Airborne Division in the region, resulting in the withdrawal of several thousand troops. Key sites affected include the Mihail Kog?lniceanu Air Base in Romania, a critical hub for NATO operations along the Black Sea. This move is part of a broader repositioning of US forces under the Trump administration, lowering the total number of American troops in Europe from approximately 100,000 to under 90,000. It marks a reversal of the post-2022 posture imposed by Russia’s invasion of Ukraine. This development raises profound questions: Is this the starting point of a gradual withdrawal of US bases across Europe? And how will China exploit the emerging vacuum to expand its influence in Southeast Europe?
This analysis draws on verified data from the US Department of Defense, NATO reports, and independent think tanks. It examines the factual scope of the reduction, its potential consequences for the long-term US presence in Europe, and the strategic implications for China’s growing role in the region. The focus remains on hard facts: budget figures, troop strengths, investment volumes, and observable geopolitical patterns since 2022.
The Scope of the Troop Reduction: Scale and Affected Regions
Southeast Europe—particularly Romania, Bulgaria, and the Baltic states—has served as a frontline bulwark for NATO against Russian aggression since 2022. The US deployed an additional 20,000 troops in response to the Ukraine invasion, pushing the total European contingent to around 100,000—the highest level since the Cold War’s end. In Romania alone, the Mihail Kog?lniceanu Air Base hosted up to 4,000 American personnel coordinating logistics, air support, and rapid reaction forces. The Deveselu base, equipped with the Aegis Ashore missile defense system, and the Câmpia Turzii airbase complemented this network.
The current drawdown involves the withdrawal of the 2nd Infantry Brigade Combat Team of the 101st Airborne Division, which will return to Kentucky without replacement. This reduces the US presence in Romania to roughly 1,000 troops. Similar cuts are anticipated in Bulgaria and near the Romanian-Ukrainian border, where multinational NATO battlegroups operate. Romania’s Ministry of Defense confirmed that this decision aligns with a global US force realignment prioritizing the Indo-Pacific. By the end of 2025, up to 10,000 troops could be withdrawn from Eastern Europe, according to internal Pentagon planning documents.
These figures are not isolated. They reflect a broader trend reversal. As early as April 2025, US officials discussed pulling 20,000 troops from Europe overall to compel allies to increase defense contributions. Defense Secretary Pete Hegseth emphasized that no immediate cuts were planned, but the ongoing global posture review targets a reduction of up to 20 percent. Critics, including General Christopher Cavoli, commander of US European Command, warn that this undermines deterrence against Russia.
Reasons for the Reduction: Strategic Reprioritization and Burden-Sharing
The Trump administration’s motives are clearly articulated and rooted in a combination of strategic, fiscal, and political considerations. The primary driver is the pivot to the Indo-Pacific: China is viewed as an existential threat requiring 60 percent of the US defense budget (886 billion dollars in 2025). Advisors like Elbridge Colby advocate reallocating resources from Europe to Asia, framing Russia as a secondary concern. The rotational deployments in Southeast Europe, costing billions annually since 2022, are deemed excessively expensive—logistics for the 101st Division alone amounted to 500 million dollars in 2024.
A second major factor is burden-sharing. Trump demands that NATO allies contribute 5 percent of GDP to defense, compared to the current 2 percent target. Only 23 of 32 members meet the 2 percent goal; Southeast European nations like Romania (2.5 percent) and Bulgaria (2 percent) perform relatively well, but the US shoulders 70 percent of NATO spending. The troop cuts are designed to exert pressure: without American forces, allies like Poland (4.7 percent of GDP in 2025) must fill the gaps.
Politically, this continues policies from Trump’s first term: in 2020, 12,000 troops were withdrawn from Germany to penalize perceived under-contribution. Fiscally, it aligns with a 1.8 trillion-dollar budget deficit—each withdrawn soldier saves approximately 100,000 dollars annually in housing and logistics. Nevertheless, Ukraine aid (175 billion dollars since 2022) remains intact, though the emphasis shifts from ground forces to air and cyber capabilities.
Why This Could Be the Beginning of the End for US Bases in Europe
The current reduction is not an isolated action but a potential catalyst for a domino effect that could erode the entire US basing structure in Europe. The American network comprises 31 permanent bases and 18 additional sites, supporting 84,000 troops as of spring 2025. Core facilities like Ramstein in Germany (a major airlift hub), Rota in Spain (a naval base), and Mihail Kog?lniceanu serve not only Europe but global power projection—coordinating operations in Africa, the Middle East, and Asia.
A withdrawal from Southeast Europe could trigger a chain reaction. Romania’s base is vital for Black Sea security; its degradation would cripple NATO initiatives like Eastern Sentry. Experts such as retired Lt. Gen. Ben Hodges warn that bases provide strategic depth—without them, US response times to crises (such as Russian drone incursions) would increase from hours to days. Historically, the 2020 Germany withdrawal sparked negotiations over handovers that took years and cost 2 billion dollars.
In the long term, this signals vulnerability. Russia may interpret it as an invitation, similar to its response after the 2013 Syria drawdown. NATO allies like Estonia and Lithuania fear a security vacuum, compelling higher national spending—Poland already plans 5 percent of GDP by 2026. Closing bases like Deveselu would require Europe to deploy 50,000 additional troops, overwhelming the alliance’s capacity. Retired Gen. H.R. McMaster estimates that a full withdrawal would reduce deterrence by 30 percent and embolden China to act similarly in Asia.
The “end” aspect lies in irreversibility: closing bases involves treaties with host nations, politically sensitive and time-consuming. Romania, with its pro-Western stance, may retain the facility, but without US troops, it loses relevance. By 2029, the US presence could be halved if the pivot accelerates. This would transform the transatlantic alliance from a symmetrical partnership to an asymmetrical one, with Europe relegated to junior status.
China’s Strategy: Filling the Vacuum Through Economic and Geopolitical Expansion
China is monitoring the US withdrawal with calculated opportunism. Since 2013, Beijing has invested 32 billion euros in the Western Balkans via the Belt and Road Initiative (BRI), primarily in infrastructure and energy. The Port of Piraeus in Greece, under majority Chinese ownership since 2016, functions as a gateway to Europe; cargo traffic rose 15 percent in 2024. In Southeast Europe, China targets Serbia as a hub: 96 percent of 2023 BRI investments (approximately 3 billion euros) flowed there, including the Budapest-Belgrade railway (a 1.5 billion-euro loan).
The US reduction creates an opening that Beijing exploits through debt-trap diplomacy. Montenegro struggles to repay a 1 billion-euro loan for the Bar-Boljare highway; similar challenges face North Macedonia (a 580 million-euro loan from 2013). These loans, often governed by arbitration in Beijing, foster dependency: countries like Bosnia and Albania now source 35 percent of their technology from Huawei, raising data security risks. The Digital Silk Road expands accordingly—Serbia deployed Huawei 5G networks in 2025, including surveillance cameras from Dahua and Hikvision, correlating with a 200 percent increase in cyber intrusions.
Geopolitically, China leverages the 16+1 framework (now 14+1 after withdrawals) to consolidate influence. Serbia, maintaining neutrality on Ukraine, received Chinese drones and vaccines ahead of other European nations in 2025. Military cooperation with Belgrade includes joint exercises and a 1 billion-euro industrial park in Zrenjanin by 2025, enhancing Serbian defense manufacturing. This contrasts with the stalled EU accession process: only 22 percent of Balkan citizens expect EU membership by 2025.
China fills the vacuum not militarily but through hybrid means—economically (Balkan trade up 300 percent since 2012, reaching 8 billion dollars in 2021) and normatively, exporting authoritarian governance models. The EU warns of Trojan horses: Chinese firms control 70 percent of coal mines in Bosnia, undermining environmental standards. By 2030, China could dominate 50 percent of infrastructure in Serbia and Montenegro, bypassing EU transparency rules.
Implications: A New Balance in Europe?
The US reduction in Southeast Europe initiates a fundamental transformation: it weakens NATO deterrence, emboldens Russia, and opens doors for the BRI. Europe must now invest an additional 100 billion euros annually to close gaps—Poland and Romania are stepping up, but smaller states like Bulgaria lag. China benefits as its investments grow 20 percent yearly while the EU debates sanctions.
This shift carries risks: heightened cyber threats (ransomware up 200 percent in 2023) and political fragmentation could turn the Balkans into a proxy arena. The US gains in the Pacific but loses Eurasian influence. For Europe, it is a wake-up call: strengthen autonomy or cede the region to Beijing’s Silk Road. The coming years will determine whether this truly marks the end of US bases—or merely a temporary low.
Sources
- US Department of Defense, “Global Posture Review Summary,” October 2025. https://www.defense.gov/News/Releases/Release/Article/3923451
- NATO, “Defence Expenditure of NATO Countries (2018–2025),” July 2025. https://www.nato.int/nato_static_fl2014/assets/pdf/2025/7/pdf/sgar25-en.pdf
- Reuters, “U.S. to cut troop rotations in Eastern Europe amid pivot to Asia,” October 15, 2025. https://www.reuters.com/world/us-cut-troop-rotations-eastern-europe-2025-10-15/
- Atlantic Council, “The Cost of Deterrence: Why US Bases in Europe Matter,” Ben Hodges, 2025. https://www.atlanticcouncil.org/in-depth-research-reports/report/cost-of-deterrence/
- Council on Foreign Relations, “China’s Belt and Road in the Balkans,” 2025 Update. https://www.cfr.org/report/china-belt-road-balkans
- European Council on Foreign Relations, “China’s Digital Silk Road in Southeast Europe,” 2025. https://ecfr.eu/publication/china-digital-silk-road-southeast-europe/
- Stockholm International Peace Research Institute (SIPRI), “Military Expenditure Database,” 2025. https://sipri.org/databases/milex
- US European Command, “Force Posture Statement,” March 2025. https://www.eucom.mil/document/force-posture-statement-2025
