Russia has carried out its largest aerial offensive against Ukraine to date, launching 479 drones and missiles overnight ahead of scheduled peace talks in Istanbul. Ukrainian air defences intercepted 385 targets during the attack, which spanned multiple regions across the country.
The assault, which began at 19:30 on 31 May, comes just one day before delegations from Ukraine and Russia are due to meet in Istanbul on Monday, 2 June. The timing of the strike has drawn attention from observers, with the scale of the offensive described by Ukraine’s Air Force as unprecedented since the start of the full-scale invasion in February 2022.
According to the Ukrainian Air Force, Russian forces launched:
472 Shahed-type attack drones and various drone decoys, from launch points in Millerovo, Shatalovo, Kursk, Oryol, Bryansk, and Primorsko-Akhtarsk;
Three ballistic missiles of the Iskander-M/KN-23 type from the Kursk and Voronezh regions;
Four cruise missiles, including air- and ground-launched Kh-101 and Iskander-K variants.
Air Defence Response and Impact
Ukrainian air defence systems neutralised 385 aerial targets. These included:
210 Shahed and other drones,
Three cruise missiles, intercepted in the country’s east, south, north, west, and central regions.
Of the total intercepted threats, 213 were destroyed by direct fire, while 172 were disrupted or lost using electronic warfare measures.
Despite the high interception rate, airstrikes hit 18 locations, though no detailed account of damage or casualties has been released at the time of writing. Emergency response efforts are ongoing.
The attack was concentrated on seven regions: Kharkiv, Sumy, Zhytomyr, Odesa, Donetsk, Dnipropetrovsk, and Zaporizhzhia—all of which have experienced repeated strikes in recent months. The use of decoy drones suggests an effort to degrade or probe Ukrainian air defences.
Diplomatic Context
The offensive occurred on the eve of a new round of talks between Ukraine and Russia, scheduled to take place in Istanbul on Monday, 2 June. Ukrainian President Volodymyr Zelensky confirmed Kyiv’s participation in the meeting, which was proposed by Russia. Ukraine’s delegation will be led by Defence Minister Rustem Umerov.
The meeting follows a previous round of talks held on 16 May, which resulted in a prisoner exchange but yielded no progress on a ceasefire agreement. Ukraine has since tabled a proposal for a 30-day unconditional ceasefire, while Russia has insisted on broader negotiations addressing the “root causes” of the conflict.
It remains unclear whether the scale and timing of the 1 June attacks will influence the upcoming discussions. Analysts note that such operations may be intended to apply pressure ahead of diplomatic engagement, or to demonstrate continued operational capability regardless of international scrutiny.
Strategic Assessment
The use of Shahed-type drones in high volume points to sustained production or foreign supply. These systems, originally developed in Iran, have become a core component of Russia’s strike strategy, particularly when deployed in swarms to overwhelm defence systems. The inclusion of ballistic and cruise missiles suggests a mixed-strike package intended to complicate interception and maximise disruption.
Ukraine continues to rely on a limited number of advanced Western-supplied air defence systems such as the Patriot, NASAMS, and IRIS-T, which are concentrated around key urban centres and infrastructure. However, Ukrainian officials have warned that current interceptor stockpiles are not sufficient to maintain this level of defensive output over the long term.
As Ukraine enters the summer with expectations of further Russian offensives and amid high-level international summits including the G7 and NATO meetings, the military and diplomatic dimensions of the conflict remain tightly interlinked.
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