French President Francois Hollande said Sunday he would not be pressured into delivering two warships to Russia, after delaying their handover due to the Ukraine crisis.

Sanctions-hit Russia risks deeper isolation from the global community unless it takes a different path on Ukraine, U.S. President Barack Obama said Sunday at the end of a stormy G20 summit.

Obama said if President Vladimir Putin "continues down the path that he is on, violating international law, providing heavy arms to the separatists in Ukraine.... then the isolation that Russia is currently experiencing will continue".

Vladimir Putin intends to cut short his attendance at the Group of 20 summit in Brisbane on Sunday, a Russian source said as the strongman faces intense pressure from the West over Ukraine.

"The program of the second day (for Putin) is changing, it's being cut short," a source in the Russian delegation told AFP on condition of anonymity.

Russian President Vladimir Putin on Saturday called on French President Francois Hollande to "minimize the risks" between their countries after months of growing tensions.

"There are a lot of turbulent moments in world affairs and not on all issues do our positions converge," Putin said on the margins of the G20 summit.

From Cheshire Cat-like grins to gloom invoking Eeyore the donkey, the diplomatic menagerie surrounding an annual Asia-Pacific summit meeting left observers with a "through the looking glass" sense of the absurd.

A week of summitry in Beijing offered insights into the diplomatic relationships -- strained as well as warm -- and the shifting dynamics of power between globetrotting leaders.

German Chancellor Angela Merkel said Tuesday that the European Union was not planning new sanctions against Russia over a fresh spike in violence in Ukraine.

Merkel reiterated that EU member states were considering adding pro-Russian separatists to existing sanction lists imposed on Moscow.

CNN said Monday it was suspending broadcasting in Russia "in light of recent changes in Russian media legislation," which aim to tighten control on independent news media.

A statement from CNN International parent Turner International, which is part of the Time Warner conglomerate, offered no specific timetable, but the Tass news agency reported earlier that broadcasts would cease as of December 31.

U.S. President Barack Obama and his Russian counterpart Vladimir Putin met briefly Monday in Beijing on the sidelines of an Asia-Pacific summit, a senior U.S. official said.

The two leaders, who have been engaged for months in a standoff over the crisis in Ukraine, "only had a brief encounter where they didn't have time to cover issues," the official said on condition of anonymity.

Russian President Vladimir Putin on Monday said that the investigation of the MH17 crash site is stalling due to Kiev's constant shelling of the rebel-controlled area in eastern Ukraine.

Putin told Malaysian Prime Minister Najib Razak that rebels were not hindering access to the site of the Malaysia Airlines crash, in which 298 people died in July when the aircraft came down in an area controlled by pro-Russian separatists.

New unidentified armored columns rumbled toward the pro-Moscow rebel stronghold in eastern Ukraine on Monday as fears grew of a return to all-out fighting in the war-torn region.

The Netherlands meanwhile was set to hold an emotional ceremony for the victims of the MH17 flight shot down over the separatist-held eastern Ukraine in July in a tragedy that brought the conflict in the ex-Soviet state to the international fore.