Russian President Vladimir Putin (L) and King Salman bin Abdul Aziz.

:: Saudi Arabia’s King Salman left Moscow on Sunday, ending his historic trip to Russia, and headed to Riyadh,

Russian President Vladimir Putin hosted King Salman for talks at the Kremlin on Thursday, cementing a relationship that is pivotal for world oil prices and could decide the outcome of the conflict in Syria.

King Salman, the first sitting Saudi monarch ever to visit Russia, led a delegation to Moscow that agreed joint investment deals worth several billion dollars, providing much-needed investment for a Russian economy battered by low oil prices and Western sanctions.