Since Hulagu's reign, the Mongols of the Ilkhanate had been at war with the Mongols of the Golden Horde.
This continued into Abaqa's reign, and the Golden Horde invaded the Ilkhanate in the Spring after his accession.
The invasion was partly due to an alliance between the Golden Horde and the Egyptian Mamluks.
 As part of this alliance, the Golden Horde would attempt to distract Abaqa through an attack on his territories to keep him from invading Mamluk-held Syria.
The hostilities continued until the death of the Golden Horde's khan Berke, in 1267.
The Great Khan Kublai attempted to intervene to stop the civil war, and due to his influence, the Golden Horde's khan, Möngke Temür did not launch a major invasion into Abaqa's territory.
However, Möngke Temür still established an alliance with the Egyptian Mamluk sultan Baibars promising that he would attack Abaqa and share any conquered territories.
However, at the same time, Möngke Temür sent envoys to congratulate Abaqa when the Ilkhan defeated Ghiyas-ud-din Baraq.
In 1270, he allowed Mengu-Timur to collect his revenues from workshops in Iran.
Since Hulagu's reign, the Mongols of the Ilkhanate had been at war with the Mongols of the Golden Horde. This continued into Abaqa's reign, and the Golden Horde invaded the Ilkhanate in the Spring after his accession. The invasion was partly due to an alliance between the Golden Horde and the Egyptian Mamluks.  As part of this alliance, the Golden Horde would attempt to distract Abaqa through an attack on his territories to keep him from invading Mamluk-held Syria. The hostilities continued until the death of the Golden Horde's khan Berke, in 1267. The Great Khan Kublai attempted to intervene to stop the civil war, and due to his influence, the Golden Horde's khan, Möngke Temür did not launch a major invasion into Abaqa's territory. However, Möngke Temür still established an alliance with the Egyptian Mamluk sultan Baibars promising that he would attack Abaqa and share any conquered territories. However, at the same time, Möngke Temür sent envoys to congratulate Abaqa when the Ilkhan defeated Ghiyas-ud-din Baraq. In 1270, he allowed Mengu-Timur to collect his revenues from workshops in Iran.
Abaqa Khan