Washington now faces choices: proceed with the deal and adjust its conception of alliances in the region or succumb to legislative stagnation and reject or downgrade the deal.
While Washington claims Tehran desires an agreement, Iran insists no dialogue will take place without the lifting of sanctions and guarantees respecting its nuclear rights.
While China has warned of serious consequences and may impose sanctions, the U.S. frames the sale as a necessary sustainment measure for existing aircraft rather than an escalation.
Yet, over the long term, tilting towards the US doesn't seem to be the natural choice, especially when America is looking to re-shore manufacturing and disengage from China-centric supply chains.