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Congress MP Manish Tewari questions alleged 2020 China Nuclear Test amid COVID-19, Galwan tensions

February 18, 2026 5 min read International Relations Internal Security GS2 (International Relations nuclear treaties India's security doctrine)
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What Happened

  • Congress MP Manish Tewari raised questions in Parliament about a Washington Post report alleging that China conducted a low-yield nuclear explosive test on June 22, 2020 — barely a week after the Galwan Valley clash between Indian and Chinese troops — at its Lop Nur test site.
  • The US Under Secretary for Arms Control, Thomas DiNanno, had formally accused Beijing of conducting "nuclear explosive tests" in 2020, though the allegation was contested: the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO) stated its monitoring system "did not detect any event consistent with the characteristics of a nuclear weapon test explosion" on that date.
  • Tewari's parliamentary intervention coincided with a broader domestic debate about whether India should conduct its own nuclear test in response to perceived changes in China's nuclear capabilities, particularly given India's 1998 moratorium on further testing.
  • China categorically denied the allegations, calling US claims "completely groundless."
  • The debate has renewed focus on India's nuclear doctrine, the CTBT's verification limitations, and India's strategic deterrence posture vis-à-vis China.

Static Topic Bridges

The Comprehensive Nuclear-Test-Ban Treaty (CTBT)

The Comprehensive Nuclear-Test-Ban Treaty (CTBT) was opened for signature in 1996 and bans all nuclear explosive tests anywhere on Earth — underground, in the atmosphere, underwater, or in space. It is one of the most widely subscribed arms control treaties but has not yet entered into force.

  • For the CTBT to enter into force, all 44 states listed in Annex 2 (states that had nuclear reactors or research facilities at the time of negotiation) must ratify it.
  • As of 2024, 187 states have signed and 178 have ratified, but 9 Annex 2 states have not ratified: China, Egypt, Iran, Israel, Russia, and the United States (signed but not ratified), and India, Pakistan, and North Korea (not signed).
  • India did not sign the CTBT on the grounds that it (a) lacked a time-bound framework for disarmament by nuclear-weapon states, (b) did not address existing nuclear arsenals, and (c) its entry-into-force mechanism was unprecedented in multilateral law.
  • The CTBT's International Monitoring System (IMS) — operated by the Vienna-based CTBTO — uses four complementary technologies: seismic monitoring, hydroacoustic sensors, infrasound sensors, and radionuclide detectors to identify potential nuclear explosions worldwide.

Connection to this news: The alleged Chinese test in 2020, if accurate, would constitute a violation of the CTBT's spirit (though China has signed but not ratified the treaty). The CTBTO's inability to confirm or definitively rule out a very low-yield test reveals a technical verification gap in the global monitoring system.

India's Nuclear Doctrine and the 1998 Moratorium

India conducted its first nuclear test (Pokhran-I, "Smiling Buddha") in May 1974, and a second series of five tests (Pokhran-II, "Operation Shakti") in May 1998 — three tests on May 11 and two on May 13. Following the 1998 tests, India declared a unilateral moratorium on further nuclear testing, which has been maintained across successive governments.

  • India's nuclear doctrine (released 1999, revised 2003) is based on: No First Use (NFU) — India will not use nuclear weapons first; Credible Minimum Deterrence (CMD) — maintaining just enough capability to deter adversaries; and Massive Retaliation — any nuclear attack on India will be met with punitive retaliation.
  • India's nuclear triad consists of land-based ballistic missiles (Agni series), sea-based missiles (K-4 and K-15 on Arihant-class submarines), and air-delivered nuclear weapons (Mirage 2000 and Rafale capable aircraft).
  • The 2008 Indo-US Civil Nuclear Agreement (123 Agreement) and India's subsequent membership of the Nuclear Suppliers Group (NSG) as an exception — and associated IAEA safeguards agreements — are built on the assumption of India's continued testing moratorium.
  • Resuming nuclear tests would likely collapse India's NSG waiver and trigger sanctions from Western nations, significantly affecting civil nuclear cooperation.

Connection to this news: Any Indian decision to test would need to balance the strategic deterrence argument (updating yield/design data against China's evolving arsenal) against the diplomatic cost of losing civil nuclear partnerships and triggering international isolation — a classic realist vs. liberal-institutionalist trade-off.

China's Nuclear Expansion and India's Strategic Calculus

China is undergoing the most significant peacetime expansion of its nuclear arsenal in its history. Satellite imagery and US intelligence assessments indicate China is constructing hundreds of new ICBM silos and expanding its warhead count from approximately 350 (2020 estimate) towards a target of 1,000 warheads by 2030.

  • China's Lop Nur test site in Xinjiang has been the location of all 45 Chinese nuclear tests conducted between 1964 and 1996.
  • China maintains a No First Use policy (like India) but has been ambiguous about its application in certain scenarios, including maritime territorial disputes.
  • India's nuclear doctrine prioritises Pakistan as the primary deterrence target but has increasingly emphasised the China dimension following the 2017 Doklam standoff and the 2020 Galwan clash.
  • The alleged 2020 Chinese test — even if only a "hydronuclear" or sub-critical experiment — could indicate efforts to improve warhead miniaturisation or yield optimisation without full explosive tests.

Connection to this news: The Galwan timing of the alleged Chinese test, if confirmed, would indicate a deliberate signal to India alongside active border tensions — underscoring the link between conventional and nuclear competition on the India-China frontier.

Key Facts & Data

  • Pokhran-I (Smiling Buddha): May 18, 1974 — India's first nuclear test.
  • Pokhran-II (Operation Shakti): May 11–13, 1998 — five tests, India declared a nuclear weapons state.
  • CTBT opened for signature: September 1996; not yet in force.
  • Annex 2 non-ratifiers: China, Egypt, Iran, Israel, Russia, USA (signed, not ratified); India, Pakistan, North Korea (not signed).
  • Alleged Chinese test date: June 22, 2020 (one week after Galwan clash, June 15, 2020).
  • China's warhead count projection: from ~350 (2020) to ~1,000 by 2030 (US DoD assessment).
  • CTBTO IMS: 321 monitoring stations worldwide using seismic, hydroacoustic, infrasound, and radionuclide technologies.