US Ambassador to Spain Benjamin Leon has called on Madrid to exercise extreme caution over China's growing footprint in sensitive sectors including telecommunications, data management, and defence, warning that unchecked access could compromise national security and bilateral intelligence-sharing with Washington. The remarks, made during Leon's first public appearances since taking office in February 2025, signal deepening American anxiety over Chinese strategic penetration in a key NATO ally.

Key Concerns Raised by the US Ambassador

Leon specifically flagged the risks of awarding public contracts to firms using technology from Huawei, the Chinese telecommunications giant that the United States has long designated a security threat. He argued that Spain's use of Huawei-linked infrastructure could fall below the security threshold required for the two allies to safely exchange sensitive information.

'I don't think that attains the level of security at which Spain and the United States are exchanging information,' Leon was quoted as saying. He also warned that China is actively seeking to dominate critical technologies globally, and that its unfair trade practices and economic coercion create systemic risks for supply chains, scientific research, and national security.

Where Leon Drew the Line

Notably, the ambassador stopped short of demanding a full economic decoupling. Leon acknowledged that Spain could maintain commercial ties with China, but stressed that robust safeguards were non-negotiable in sectors deemed critical to national security. 'If Spain ensures that China is kept out of critical areas, why not negotiate,' he stated, before adding, 'But I see that they are starting to penetrate into critical areas and Spain must be really careful about this.'

A Strained Bilateral Backdrop

Leon's warning arrives against a backdrop of notable friction between Madrid and Washington. Spain has declined to endorse a NATO commitment to raise defence spending to 5 per cent of GDP, a stance that has drawn criticism from US officials. The tension escalated further in March 2025, when Spain refused to allow the US to use its military bases and airspace for operations linked to the conflict with Iran.

That refusal prompted the Pentagon to withdraw a dozen KC-135 tanker aircraft from bases at Moron de la Frontera in Seville and Rota in Cadiz. Spanish Defence Minister Margarita Robles defended the decision, stating that the cooperation agreement with Washington must operate within international law and cannot be invoked for unilateral actions lacking the backing of a multilateral body such as the United Nations, NATO, or the European Union (EU).

'The bases will not provide support unless it is necessary from a humanitarian point of view. Until there is a resolution, the treaty does not apply,' Robles stated.

Broader Implications for Europe

Spain is not alone in navigating this tension. Several European governments have faced similar US pressure to limit Huawei's role in 5G infrastructure, with Germany, France, and the United Kingdom having already moved to restrict or phase out the firm's equipment. Spain's position is complicated by its economic ties with Beijing and its domestic political calculus, making it one of the more contested battlegrounds in the West's broader technology-security debate.

With NATO's next summit approaching and US-Europe relations under strain over defence burden-sharing, Leon's public remarks are likely to intensify pressure on the Spanish government to clarify its posture on Chinese technology in critical infrastructure.