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Several cargo aircraft of the Turkish Air Force were spotted flying to Azerbaijan. They are likely transporting heavy equipment to take part in the joint exercises that kick on October 5th.
At least four Turkish military cargo planes flew to Azerbaijan.
One Airbus A400M-180, one Lockheed C-130EM Hercules and two Lockheed C-130E Hercules aircraft took off from Turkish Isparta and Kayseri airports. The aircraft landed in Sumgayut, north of Baku, and latter left Azerbaijan.

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Baku and Ankara are preparing for joint military exercises that will take place from October 5th to October 8th in the Azerbaijani Nakhchivan Autonomous Republic near the border with Iran.
“Unshakable Brotherhood”exercises will be conducted in order to “develop friendship, cooperation and coordination between the Turkish and Azerbaijani Land Forces,”according to the Turkish Defense Ministry.

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The Ministry also claimed that the rehearsals of drills were carried out successfully, sharing some footage.

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On September 4th, Turkish Minister of National Defense Hulusi Akar went to Tbilisi, the capital of Georgia, to attend the Georgia-Turkey-Azerbaijan Defense Ministers Meeting.
The meeting took part amid the joint “Eternity-2021” military exercises with Georgian, Azerbaijani and Turkish servicemen that were launched in Georgia on October 4th.
Millî Savunma Bakanı Hulusi Akar, Azerbaycan Savunma Bakanı Org. Zakir Hasanov ile görüşmesinde, “Tek Vatan Harekâtı”nın yıl dönümü dolayısıyla Azerbaycan Silahlı Kuvvetlerini bir kez daha kutladı.https://t.co/PsUrLjR2bw#MSB #HulusiAkar pic.twitter.com/qFqB3Lyq7P
— T.C. Millî Savunma Bakanlığı (@tcsavunma) October 5, 2021
A few weeks ago, on September 15th, other Turkish-Azerbaijani joint exercises TURAZ Hawk 2021 were completed in Konya.
The new round of military exercises takes place amid the growing tensions between Azerbaijan and Iran. Tehran has also increased the military activity in the border regions. The Khyber Conquerors wide-ranging military exercises were launched on October 1 near the border with Azerbaijani Nakhchevan region.