There have been previous clashes between the two countries over its control. The six-year war ended in 1994, but no peace agreement was ever signed.
Although the area is internationally recognized as part of Azerbaijan, it is controlled by ethnic Armenians in support of the Armenian government.
In an interview with the BBC, the Azerbaijani president said he did not see any possibility of peace with Armenian Prime Minister Nikol Pashinyan.
Shortly after the interview, he announced that his country’s forces had captured Shusha, the second-largest city in Nagorno-Karabakh. But the Armenian government has denied the allegations, saying the fighting continues.
This city is known to the Armenians as Shushi.
According to a BBC correspondent, the capture of the strategically important city of Nagorno-Karabakh would be a major win for Azerbaijan in the war.
The town of Shusha is built on a hill near Stepanakert, the capital of Nagorno-Karabakh. The road that goes through it is connected to Armenia.
Experts believe that if the city is captured, it will be easier to attack the capital, Stepanakert.
The Azerbaijani president described the occupation of the town as “liberating” the area.
“There is no force in the world that can stop us,” he said. Before claiming to occupy Shusha. “Armenia’s time is up,” Aliyev told the BBC.
He said that by using force, they are getting back these areas, and because of this, the chances of resolving the crisis through compromise are decreasing.
Soon after President Aliyev’s announcement, people in the streets of Baku, the capital of Azerbaijan, cheered.
Although the war between the two countries started abruptly on September 26, it is seen that since the end of October, Azerbaijan has gradually moved towards Nagorno-Karabakh.