On the second phase of U.S.-Iran war

1. At a Glance

Second phase of the Iran-U.S. war is fought almost exclusively over control of the Strait of Hormuz, the chokepoint carrying ~one-fifth of global oil and gas trade [S1][S2].
A June 17, 2026 ceasefire and MoU ended the first phase, but ambiguity over who administers the strait triggered renewed hostilities — a live case study in how imprecisely drafted ceasefire terms can unravel [S1][S2].
Relevant for UPSC as a geopolitics/energy security current affairs topic touching West Asia, freedom-of-navigation norms, and India's crude-oil import exposure.

Iran's Persian Gulf Strait Authority (PGSA), set up in May 2026, reasserted itself as nodal transit authority, mandating passage permits and PGSA-approved insurance for vessels, reigniting the dispute weeks after the ceasefire [S1].
Subsequent U.S.–Iran talks in Doha broke down over U.S. resistance to Iran's formal management plan for the strait [S1].
UN Secretary-General António Guterres called for a renewed diplomatic push after fresh strikes hit civilian areas amid the escalation [S2].

Ceasefire agreed June 14, 2026; MoU terms finalised soon after, signed by President Trump and Iranian President Masoud Pezeshkian [S1].
MoU stipulated: Iran to allow ships free passage through Hormuz for 60 days only (no charge), and Iran to work with Oman to define future administration and maritime services in the strait [S1].
Two days after the MoU, PGSA circulated terms reasserting control — permits and insurance mandatory (free "for now," fees reserved for later) [S1].
U.S. and Iranian delegations met in Switzerland on June 21 to discuss implementation [S1].
Follow-on Doha talks (facilitated via Qatar) failed to resolve the dispute over a formal management structure for the strait [S1].

Item	Detail
Flashpoint	Strait of Hormuz — key oil/gas transit chokepoint [S1][S2]
Ceasefire date	June 14, 2026 [S1]
MoU signatories	U.S. President Trump; Iran President Masoud Pezeshkian [S1]
Free-passage window under MoU	60 days, no charge [S1]
Third-party administrator named in MoU	Oman (co-defines future administration/maritime services) [S1]
Iranian transit body	Persian Gulf Strait Authority (PGSA), established May 2026 [S1]
PGSA requirements	Passage permit + PGSA-approved insurance per vessel [S1]
Negotiation venues	Switzerland (June 21 meeting); Doha (follow-up talks, broke down) [S1]
UN position	Guterres calls for renewed diplomatic push; UN denounces strikes on civilian areas [S2]

Geopolitical/Strategic: Control of Hormuz gives Iran leverage over global energy flows; U.S. insists on unrestricted freedom of navigation without tolls, a core maritime-law principle [S2].
Economic: Shipowners are reportedly resigned to paying a "logical" toll, but fear the precedent this sets for other global straits/chokepoints (e.g., Bab-el-Mandeb, Malacca) [S1].
Legal/International Law: Dispute centers on conflicting interpretations of the MoU — Iran reads it as affirming its administrative control (toll rights); the U.S. and international community read it as guaranteeing free, unrestricted passage [S2].
Diplomatic/Institutional: Multiple negotiation tracks (Switzerland, Doha, Oman-mediated) reflect fragmented, still-unsettled dispute-resolution architecture [S1].
Humanitarian: UN flags strikes on civilian areas as escalation risk, prompting Secretary-General intervention [S2].

May 2026: Iran establishes the Persian Gulf Strait Authority (PGSA) to handle Hormuz transits [S1].
June 14, 2026: Ceasefire agreed between Iran and U.S. [S1].
June 17, 2026: MoU signed by Trump and Pezeshkian, setting 60-day free-passage window [S1].
June 19–21, 2026: PGSA circulates transit terms; U.S.-Iran delegations meet in Switzerland [S1].
July 2026: Doha talks collapse over U.S. rejection of Iran's formal management plan; hostilities resume ("second phase" of the war); UN chief calls for renewed diplomacy [S1][S2].

Strait of Hormuz carries roughly one-fifth of world oil and gas supplies [S2].
Iran-U.S. ceasefire of the first phase of the war was agreed on June 14, 2026 [S1].
The MoU ending phase one was signed by U.S. President Trump and Iranian President Masoud Pezeshkian [S1].
MoU allowed 60 days of free (no-charge) passage for ships through Hormuz [S1].
Iran was tasked to define future strait administration jointly with Oman, per the MoU [S1].
Persian Gulf Strait Authority (PGSA) — Iranian body set up in May 2026 to manage Hormuz transits [S1].
PGSA mandated a passage permit and PGSA-approved insurance for every vessel [S1].
U.S.-Iran delegations met in Switzerland on June 21, 2026 [S1].
The second-phase talks that broke down were held in Doha, Qatar [S1].
UN Secretary-General who called for renewed diplomacy amid the escalation: António Guterres [S2].
The core U.S.-international position: freedom of navigation through Hormuz without fees [S2].

GS-II: International Relations — bilateral/multilateral disputes, role of international mediation (Oman, Qatar), UN's role in conflict de-escalation.
GS-III: Internal Security/Economy — energy security implications for oil-importing nations like India, impact on global shipping and chokepoint vulnerabilities.
Possible Mains stems: 1. "Discuss the strategic significance of the Strait of Hormuz and examine the implications of the 2026 Iran-U.S. conflict on global energy security." (GS-III) 2. "Ceasefire agreements without precise implementation mechanisms risk relapse into conflict. Discuss with reference to the 2026 Iran-U.S. MoU on the Strait of Hormuz." (GS-II) 3. "Examine India's strategic and economic vulnerabilities arising from instability in West Asian maritime chokepoints." (GS-III)

Strait of Hormuz geography and chokepoints — foundational geography for the dispute.
India's crude oil import dependence — direct economic exposure to Gulf disruptions.
UNCLOS and freedom of navigation — legal framework underlying the U.S. position.
Abraham Accords / Israel-Iran dynamics — broader regional context of the war's first phase.
Qatar and Oman's mediating role in West Asia — recurring diplomatic actors in Gulf crises.
Global chokepoints (Bab-el-Mandeb, Malacca Strait, Suez Canal) — precedent concerns raised by shipowners.
India's Strategic Petroleum Reserve (SPR) — policy response to such supply shocks.

Do not confuse the first phase (direct Iran-U.S.-Israel strikes, ended by the June 14 ceasefire) with the second phase (a dispute specifically over strait administration/tolls, not renewed direct military conflict at the outset).
The MoU's 60-day free-passage clause is often misread as a permanent toll-free guarantee — it was explicitly time-bound and silent on the post-60-day fee regime.
PGSA is an Iranian domestic body (est. May 2026), not a UN or multilateral institution — avoid conflating it with international maritime authorities.
Oman's role is as co-definer of future administration, not as a neutral third-party operator/owner of the strait.

[S1] The second phase of U.S.-Iran war — The Hindu — https://www.thehindu.com/todays-paper/2026-07-20/th_chennai/articleG3AG9AF1G-15531492.ece — (tier: 4)
[S2] US-Iran war: UN chief calls for new diplomatic push following attacks on civilian areas — UN News — https://news.un.org/en/story/2026/07/1167973 — (tier: 2)