TAPI is not a feasible project at the moment due to the following reasons:
1 - No confirmed reports of reserves of Gas from Turkmenistan Govt.
2 - No clear strategy defined by Afghanistan for the protection of 850 km of pipe line passing in heart of insurgents controlled area.
3 - Difficulties for Pakistan to safe guard 750 km of pipe line passing through mountainous part of Baluchistan.
4 - Cost of TAPI much higher than IP
5 - No seriousness shown by Indians to go ahead with TAPI
6 - No infrastructure in Turkmenistan for supply of more than 35 BCMA, their current production is all already booked for sales to China / Russia etc.
Regarding IP, Let me say that we have much more benifits than US sanctions;
1 - Gas already available.
2 - Much less cost
3 - Route of IP is safer (relatively) than TAPI
4 - We can Trade price of Gas for exporting our goods to Iran (not feasible the same for TAPI)
Regarding US sanctions; i would rather say that actually US never helped us. They spend 70% of their "AID" through their own NGOs and almost 50% of moneys goes in wages / logistics etc. They were never a trustworthy ally with Pakistan. Right from 1965 till now. They have USED our politicians and military commanders always for their own benefits. The put sanctions on Pakistan even in the time when india did they operation "Smiling budha" in 1974 (nuclear test). There are countless such examples in which Pakistan was left on its own in serious times of crises.
LET US NOT FORGET THAT US TREATS EVERY COUNTRY AS CHEWING GUM "GOOD TO KEEP IN MOUTH TILL IT HAS TASTE AND SPIT IT ONCE CONSUMED"
Let us go ahead with IP and also CASHNUPP III and IV. We have to stand on our FEET. I strongly believe that ONCE we will come out of US AID dilemma we will grow better and behave better. Not all 250 countries in the world depend on US AID.
Not to forget the price we have PAID for fight of US on our soil.
HAPPY PAKISTAN DAY TO ALL