Vladimir Putin has said he will abide by a rule banning the Russian president from serving two consecutive terms, indicating he will step down from his post in 2024 when his term expires.

But his remarks, made to reporters at an economic forum in St Petersburg and broadcast on state TV, do not necessarily mean he will relinquish power in six years’ time.

Mr Putin stepped down as president in 2008 after serving two successive terms. He then returned in 2012 after a spell as prime minister – a manoeuvre he would be legally able to complete again.

Asked if and when he would be leaving office, he said: “I have always strictly abided by and abide by the constitution of the Russian Federation.

“In the constitution it’s clearly written that nobody can serve more than two terms in a row … I intend to abide by this rule.”

Mr Putin won a landslide victory in elections in March that extended his tenure by six years. If Mr Putin remains in power until 2024, he will have been either in direct or indirect control of Russia for 24 years, making him Moscow’s longest-serving leader since Josef Stalin.

The St Petersburg International Economic Forum was also used by the Russian president to warn the US’ exit from the Iran nuclear deal could trigger dangerous instability.

“We can’t sort things out with North Korea. Do we want another problem on the same scale?” he asked.