For most of the world, the US-Iran war carries minimal upside (the reduction of Iran-sponsored terror groups in the Middle East) for considerable risk (terror attacks on their citizens). Previously, allies and partners were willing to grant access to their airbases and provide other forms of support and put their citizens at risk to maintain good relations with the US, because that meant something. With Trump in the White House, the US has become an unreliable and unpredictible banana republic, where government action is not grounded in sound policy or long-term international relationships, but depends entirely on the moods of El Presidente and serves his personal wallet.
He has made time and time again clear that he is not bound by any earlier agreements and commitments, so it should not come as a surprise when others respond with the same and propose starting negotiations from a clean slate.