1) Iran and Pakistan
2) India and Pakistan
3) India and Bhutan
4) Pakistan and Afghanistan
Explanation:
Iranian President Hassan Rohani and visiting Pakistani Prime Minister Imran Khan have agreed for setting up a joint border ‘Reaction Force‘ to combat the attacks by militant groups on both sides their frontier. The Iran-Pakistan border encompasses the south-eastern Iranian province of Sistan-Baluchestan (the second largest province of Iran with its capital Zahedan) where frequent attacks on Iran’s security forces have taken place.Since Iran-Pakistan relations had gone downhill with both the nations accusing each other for not taking enough steps to eradicate militants, they have decided to collaborate to form a joint quick reaction force by increasing cooperation between border forces and intelligence agencies.