On Wednesday, the US warned Pakistan to "avoid any sanctionable activity" in connection with the project.

BBC: Pakistan-Iran pipeline work 'to begin on 11 March'

Arguing baseless defenses such as breach of contract or fraud without good faith grounds to raise it is sanctionable and possibly perjury.

FORBES: Many Consumer Bankruptcies Do More Harm Than Good

As a result of this determination, significant transactions between foreign banks and the Central Bank of Iran for purchases of petroleum and petroleum products from Iran will be sanctionable as of June 28th.

WHITEHOUSE: The White House

Just to give you some context for what we are announcing today, Section 1245 of the NDAA added to existing U.S. sanctions because it made sanctionable certain significant transactions between foreign financial institutions in the Central Bank of Iran.

WHITEHOUSE: The White House