Iran's Foreign Ministry spokesperson Abbas Mousavi said Tuesday that Iran welcomes any constructive measures that aim to save the 2015 nuclear deal.

"As in the past, Iran is fully ready to receive any well-intended and constructive measures to salvage this important international deal, and it supports any initiative in this regard," Mousavi said.

"In the meantime, Iran clarifies it to all and particularly to three European parties of the deal that any breach of vows, mal-intention and unconstructive measures will be responded in a serious and appropriate manner," he added.

Mousavi's remarks came in reaction to the move adopted by Britain, France and Germany on Tuesday to trigger the dispute resolution mechanism in the 2015 nuclear deal with Iran.

The European powers said they were acting to avoid a crisis over nuclear proliferation adding to an escalating confrontation in the Middle East. Russia, another signatory to the pact, said it saw no grounds to trigger the mechanism and Iran dismissed the step as a "strategic mistake".

The three countries said they still wanted the nuclear deal with Tehran to succeed and were not joining a "maximum pressure" campaign by U.S. President Donald Trump's administration, which abandoned the pact in 2018 and has reimposed economic sanctions on Iran.

The Iranian spokesperson denounced the Europeans' move as a "passive" step, saying that Iran had started the dispute resolution mechanism one year ago but "nothing new has happened in practice".

Russia's Foreign Ministry said activating the mechanism could make it impossible to resume implementation of the deal.

(With input from agencies)