According to Russian Presidential spokesman Dmitry Peskov, Tehran's backtracking on the agreement was due to external pressure.
"We see the consequences [of rash US moves towards Iran]. Of course, Russian diplomats will continue to discuss this topic with our European partners in order to work on preserving the viability of this accord", he told journalists.
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Peskov also stressed that it is premature to talk about imposing sanctions against Tehran following its suspension of some of its obligations
In 2018, all the other signatories — Russia, China, Germany, France, the UK, and the EU — refused to follow the US example and confirmed their commitment to the accord, trying to save the deal with the Islamic Republic.