Originally published 2021-11-16.
On 16 November 2021, the deadliest fighting since the end of the 2020 war broke out on the eastern border between Armenia and Azerbaijan. Armenian officials said 15 of their soldiers were killed and 12 captured, and that two positions were lost. Yerevan asked Russia, its treaty ally, to help defend its territory. By the evening of the same day, both sides had agreed to a ceasefire mediated by Moscow, and the front line was described as relatively stable.
This article explains what happened that day, why Russia was the first country Armenia turned to, and how the conflict developed in the years that followed.
The clash of 16 November 2021
The fighting took place along the eastern section of the international border between the two countries, rather than inside Nagorno-Karabakh itself. Both governments gave opposing accounts of who started it.
Azerbaijan's defence ministry said its troops had responded to large-scale provocations after Armenian forces shelled its positions, and that its operation had succeeded. Its military also claimed that Armenian soldiers were abandoning their positions in panic and that Armenian equipment had been destroyed. Armenia said Azerbaijani forces had attacked its sovereign territory.
The casualty figures came from the Armenian side: Eduard Aghajanyan, head of the Armenian parliament's foreign relations committee, said 15 soldiers had died, and the defence ministry said 12 had been taken prisoner. Azerbaijan did not publish a full tally on the day. Early figures in clashes like this are often revised, so they are best read as the claims of each government at the time.
Why Armenia called on Moscow
Armen Grigoryan, secretary of Armenia's Security Council, told reporters that because Azerbaijan had attacked Armenian territory, Yerevan was asking Russia to defend its territorial integrity under the countries' 1997 mutual assistance treaty. Armenia is also a member of the Russian-led Collective Security Treaty Organization, and Russia keeps a military base at Gyumri in the north of the country.
Moscow responded through diplomacy rather than troops. President Vladimir Putin discussed the situation by phone with Armenian Prime Minister Nikol Pashinyan, and Defence Minister Sergei Shoigu called his counterparts in both countries. Russia urged both sides to step back, and the ceasefire was announced the same day. France, which co-chaired the international Minsk Group on Karabakh and has a large Armenian community, said it was very concerned and called on both sides to respect the truce.
Ten days later, on 26 November, Putin hosted Pashinyan and Azerbaijan's President Ilham Aliyev in Sochi, where the leaders agreed to work towards demarcating their border.
Background: the 44-day war of 2020
The 2021 clash came a year after a much larger war. Nagorno-Karabakh, known to Armenians as Artsakh, is internationally recognised as part of Azerbaijan but had been controlled by ethnic Armenians since the early 1990s. Armenians have lived in the area for many centuries, and it contains ancient churches and monasteries.
Fighting began on 27 September 2020 and lasted 44 days. Azerbaijan, which used Turkish and Israeli-made drones to great effect, recaptured the surrounding districts and parts of Karabakh itself, including the town of Shusha. Turkey gave Azerbaijan strong political and military backing, and there were widely reported allegations, documented by monitors such as the Syrian Observatory for Human Rights, that hundreds of Syrian fighters were recruited to fight on the Azerbaijani side; Baku denied this. Each side accused the other of attacks on civilians.
Official figures put military deaths at 3,825 for Armenia and 2,906 for Azerbaijan, with dozens of civilians killed on each side. A Russian-brokered agreement signed on 9 November 2020 ended the war, and almost 2,000 Russian peacekeepers deployed along the line of contact and the Lachin corridor, the only road linking Karabakh to Armenia.
Turkey, history and Armenian fears
For Armenians, Turkey's close alliance with Azerbaijan is not just a matter of modern geopolitics. During the First World War, the Ottoman Empire, the predecessor of modern Turkey, carried out the Armenian Genocide, in which historians estimate up to 1.5 million Armenians were killed. Turkey still rejects the term genocide.
That history helps explain why border incursions after 2020 caused such alarm in Armenia, and why some Armenians feared a wider attack on the country itself, possibly with Turkish support. Armenia and Turkey have no diplomatic relations and their shared border has been closed since 1993.
What happened next
The November 2021 ceasefire did not end the border crisis. Further clashes followed, and in September 2022 the fighting spread deeper into Armenian territory. Russia, absorbed by its war in Ukraine, did little, and Armenian disappointment with Moscow and the CSTO grew.
In December 2022 the Lachin corridor was blocked, causing severe shortages in Karabakh. On 19 September 2023 Azerbaijan launched a one-day offensive. The Karabakh authorities agreed to disarm, and within two weeks more than 100,000 people, almost the entire Armenian population of the region, had fled to Armenia. The breakaway republic's leader signed a decree to dissolve its institutions by 1 January 2024.
Diplomacy then shifted towards Washington. On 8 August 2025, Pashinyan and Aliyev initialled the text of a peace agreement at the White House, together with a joint declaration on moving towards signing and ratification. The plan includes a transit route through southern Armenia linking mainland Azerbaijan with its Nakhchivan exclave, to remain under Armenian law.
Key points to remember
- The 16 November 2021 fighting happened on the Armenia–Azerbaijan border, not inside Karabakh.
- Armenia reported 15 soldiers killed and 12 captured; each side blamed the other for starting it.
- Russia brokered a same-day ceasefire, but did not intervene militarily, a pattern that later fuelled Armenian frustration.
- The clash was part of a chain of events that ended with Azerbaijan taking full control of Karabakh in 2023 and peace talks in 2025.
Sources: Reuters, original report (16 November 2021); Cyprus Mail (Reuters), Armenia says 15 of its soldiers died in border clashes; 2020 Nagorno-Karabakh war (Wikipedia); 2023 Azerbaijani offensive in Nagorno-Karabakh (Wikipedia); Armenia–Azerbaijan peace agreement (Wikipedia).
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