VIDEO SHOWS: RUSSIAN PRESIDENT VLADIMIR PUTIN AND SAUDI ARABIA'S CROWN PRINCE MOHAMMED BIN SALMAN LAUGH TOGETHER AS THEY SHAKE HANDS AT THE START OF G20 SUMMIT RESENDING WITH COMPLETE SCRIPT SHOWS: BUENOS AIRES, ARGENTINA (NOVEMBER 30, 2018) (SUMMIT POOL - ACCESS ALL) 1.

RUSSIAN PRESIDENT VLADIMIR PUTIN LAUGHING AS HE SHAKES HANDS WITH SAUDI ARABIA'S CROWN PRINCE MOHAMMED BIN SALMAN AS LEADERS GATHER FOR THE START OF THE G20 SUMMIT 2.

LEADERS GATHERING FOR G20 ROUNDTABLE 3.

PUTIN AND CROWN PRINCE MOHAMMED LAUGHING AS THEY SIT NEXT TO EACH OTHER 4.

G20 ROUNDTABLE BUENOS AIRES, ARGENTINA (NOVEMBER 30, 2018) (REUTERS PICTURES - ACCESS ALL) (MUTE) 5.

STILL PHOTOGRAPH OF SAUDI CROWN PRINCE MOHAMMED MAKING GESTURE AT PUTIN, WHO IS SMILING, AT G20 ROUNDTABLE 6.

VARIOUS STILL PHOTOGRAPHS OF PUTIN AND CROWN PRINCE MOHAMMED LAUGHING TOGETHER AT G20 ROUNDTABLE 7.

VARIOUS STILL PHOTOGRAPHS OF PUTIN AND CROWN PRINCE MOHAMMED STANDING NEAR EACH OTHER AHEAD OF THE G20 FAMILY PHOTO STORY: Russian President Vladimir Putin and Saudi Arabia's Crown Prince Mohammed bin Salman shared a joke at the G20 summit in Buenos Aires on Friday (November 30), laughing heartily as they took seats next to each other in the main meeting room.

Earlier, Saudi's de facto ruler Crown Prince Mohammed was sidelined during the official "family photo" of world leaders and other dignitaries at the Group of 20 summit, standing at the far edge of the group portrait and ignored.

His presence at the international summit has been contentious following the killing of Saudi journalist Jamal Khashoggi at a Saudi consulate in Istanbul in October.

Russia's seizure of Ukrainian vessels and their crews on Sunday (November 25) near Crimea has raised fears in the West of a wider conflict between the two countries.

Russia said said the ships were illegally entering Russian waters, which Ukraine denies.

European Council President Donald Tusk told the summit the European Union would extend its economic sanctions on Moscow next month because of the incident.

U.S. President Donald Trump cancelled his planned meeting with Putin over the crisis, while British Prime Minister Theresa May called on Russia to release the boats and sailors that it captured.

Putin and the Saudi crown prince are due to hold a bilateral meeting on Saturday (December 1) afternoon, which oil markets will be watching closely for any sign of a breakthrough in a deal for Russia to participate in a production cut by the OPEC oil cartel next month.