The fallout over the Iran deal is a rare topic for rapprochement between Europe and Moscow, whose relations are marred by disagreements over the Syria conflict, Moscow's 2014 annexation of Crimea and the subsequent war in eastern Ukraine.
These tensions have only worsened in recent months following the poisoning of former Russian spy Sergei Skripal in Britain that led to an unprecedented wave of expulsions of Russian diplomats from Western countries.
As part of the historic 2015 Iran deal, Tehran agreed to curb its nuclear programme by pledging not to seek an atomic bomb in exchange for the lifting of some international sanctions.
The Europeans now want to avoid at all costs Tehran abandoning the deal and relaunching its programme to acquire a nuclear weapon. They also want to protect their economic interests in Iran, threatened by Washington's reintroduction of sanctions.
The Kremlin has in recent days increased its diplomatic efforts to try to maintain the agreement it described as "crucial for regional stability and for the stability of the entire world".
Merkel's visit comes ahead of Macron's trip to Saint Petersburg on May 24.
Putin and Merkel last met for bilateral talks in May 2017, also in Sochi.
"In the current situation it provides a great opportunity for them to synchronise their watches on the most pressing international and regional problems, of course Syria, of course Ukraine," Peskov told journalists ahead of the meeting.
The Russian president said the "military success" in Syria allowed for a large-scale "political process" leading to the withdrawal of foreign forces and the reconstruction of the country.
On May 12, Merkel expressed concern about the situation in Ukraine, where she said there are "violations of the truce every night and loss of life every day".
According to Moscow, the two leaders will try to organise a four-way meeting with the presidents of France and Ukraine to advance a possible UN peacekeeping meeting. The last summit between the four countries, known as the Normandy Quartet, was held in October 2016 and was inconclusive.
"There has been a considerable pause in the work and you can expect the issue will be discussed extensively," said Peskov.
Merkel and Putin are also expected to discuss the construction of a second Nord Stream underwater pipeline linking the two countries via the Baltic Sea, a project several EU countries oppose.
"The situation is quite complicated given recent statements coming from Washington," said Peskov. "Of course that issue will have a big place on the agenda, you can be quite certain of that.
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