1 “...- or veto threat- has been employed in treaty negotiations of the past two decades. As he explains...”

2 “...— or veto threat— has been employed in treaty negotiations of the past two decades. As he explains...”

3 “... in treaty negotiations of the past two decades. As he explains, the importance of veto power in treaty...”

4 “... in treaty negotiations of the past two decades. As he explains, the importance of veto power in treaty...”