While they are partners on the oil market, on the foreign policy front, Moscow and Riyadh are on opposite sides of the war in Syria, with Russia supporting President Bashar al-Assad while Saudi Arabia supports the opposition.
Salman and Putin are expected to discuss major defence and energy contracts, as well as extending oil production cuts ahead of the OPEC oil cartel meeting in November.
Members of OPEC, of which Saudi Arabia is the biggest producer, have joined with non-member Russia and other countries in cutting crude output in a pact that has helped prop up prices.
Yesterday Putin said an extension of the OPEC deal was possible and could last "at least to the end of 2018".
"Russian-Saudi contacts are important and their potential is rather great," Kremlin spokesman Dmitry Peskov told journalists.
"The political will of Moscow and Riyadh for deeper cooperation on the widest range of issues is clear," he added.
The escalator stopped midway, forcing the king to walk down himself, to be met by Russian officials including deputy prime minister Dmitry Rogozin and a military brass band.
King Salman arrived with a delegation of more than 1,000 people, reported Kommersant business daily.
Kommersant also said Putin and Salman are due to discuss an arms deal worth more than USD 3 billion to supply Riyadh with S-400 air defence systems.
The Kremlin said ahead of the visit that Salman and Putin would also discuss "the situation in the Middle East and North Africa, especially focusing on conflict situations in the region."
The two diverge on both Syria -- where more than 330,000 people have been killed since war erupted in 2011 -- and Yemen, where a Saudi-led coalition has been bombing Huthi rebels since 2015, drawing criticism from Moscow.
The Saudi king's Kremlin meeting with Putin was expected to begin at 1000 GMT, to be followed by a state dinner.
The countries' foreign ministers were set to meet later in the day.
Russian Foreign Minister Sergei Lavrov hailed Salman's visit as "truly an epoch-making event in our relations," in an interview published yesterday by the Saudi-owned newspaper Asharq al-Awsat.
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