The range of a Mig-29K with 4 tanks is 3000Km. The centre line is used up for the pod. The armed Mig-29K with a centre tank and 2 wing tanks will also give 3000Km range. The remaining two heavy points are required for bombs.
If refuelling takes place at Porbandar, even if the refuellers land at Porbandar after refuelling thereby giving up their entire possible fuel load for the mission, the armed Mig-29K's range is still 3000Km. So the effective combat radius of the Mig-29K is only 1500Km. On rechecking, I found out that the distance between Porbandar and Tashkent is 2200Km. It's impossible for the armed Mig-29K to go beyond Kabul if the refuelling point is at Porbandar.
Your refuelling point has to be at least 1500Km away from the target. Like Bikaner. Of course even 1500Km is unrealistic since you need fuel for reserve, combat etc, while the bomb load will also swallow some fuel up.
In Falklands, the Vulcans were supported by Victor. And the Victor had a range of 10,000Km, which was more than the 6500Km range of the target. So the Victor had enough fuel to transfer, while the Vulcan had a range of 4000Km. IIRC, 11 Victors were used for the refuelling missions in the first mission. In our case, the buddy refueller has the same range as the armed Mig-29K, so both will hit bingo at the same time.
A more realistic scenario for us is if our strike package takes off from Mangalore, is refuelled in Ambala by buddy refuellers that were previously stationed in Ambala, and then are refuelled again in Ambala before the strike package returns home to Mangalore. From Ambala to Tashkent, with a distance of 1200Km, the Mig-29Ks will have more than enough fuel for combat and diversion if necessary.