but said they were not joining the United States campaign to exert maximum pressure on Tehran.

"We do not accept the argument that Iran is entitled to reduce compliance with the JCPoA," the three countries said in a joint statement, saying they had no choice but to trigger the process that could eventually lead to U.N. sanctions.

"Instead of reversing course, Iran has chosen to further reduce compliance."
[...]
"We do this in good faith with the overarching objective of preserving the JCPoA and in the sincere hope of finding a way forward to resolve the impasse through constructive diplomatic dialogue, while preserving the agreement and remaining within its framework," they said.