"Of course, a new meeting is possible", said Ushakov.
Ukraine has also imposed restrictions on entry for foreigners into Crimea, and the European Court of Human Rights said that Kyiv has filed a complaint against Russian Federation over the maritime confrontation.
Trudeau says frank and direct conversations with leaders is better than not talking.
Ukrainian President Petro Poroshenko said on Saturday his country had stepped up security at vital infrastructure sites such as nuclear power stations and Black Sea ports in the face of what he called a Russian test of the world order.
The leaders met amid a global outcry over the death of a USA -based columnist who was killed at the Saudi Consulate in Istanbul.
WH: Trump's Formal G-20 Meetings With Turkey, South Korea Canceled
The US president added, however, that he looked forward to a meaningful summit as soon as the Kerch strait situation is resolved. Hopes of progress over tariffs in Mr Trump's expected talks with Chinese leader Xi Jinping have been dampened.
Trump's snub was a clear kick at Putin as he joined a Group of 20 gathering in Argentina, where Western leaders banded together to denounce Russia's actions in Ukraine.
Russian Federation and Ukraine have blamed each other for the November 25 clash in the Kerch Strait, which links the Black Sea and the Sea of Azov.
Still, what Putin really wants is to make a deal with Trump.
In addition, the Russian leader expressed regret that he could not have a full-length meeting with Trump.
"If the domestic situation and the pressure from Russophobes like Ukraine and its sponsors prevent the U.S. president from developing normal ties with the Russian president. we will wait for another chance", Russian Foreign Minister Sergey Lavrov said, adding "love can't be forced".
Saudi crown prince and Indian PM meet in Buenos Aires
The Senate on Wednesday voted across party lines to move forward a bill that would end U.S. involvement in the war in Yemen. USA intelligence officials believe the Saudi crown prince must have at least known of the plot to kill him.
"We had an opportunity to discuss the ongoing process in Northern Syria with the U.S.as two strategic partners".
The spokesman said Putin had explained the situation in the Kerch Strait and the Sea of Azov to French President Emmanuel Macron and German Chancellor Angela Merkel in their meetings in Buenos Aires, but Trump missed the opportunity.
He and Mr Trump will meet later for talks over dinner, it has been announced. News reports said they did not greet one another when leaders gathered at the start, and they stood far apart when leaders and their spouses posed for a photograph later in the day.
And he cosied up at Friday's round-table talks to Saudi Crown Prince Mohammed bin Salman, somewhat of a fellow outcast at the G-20 over his suspected role in the killing of a dissident Saudi journalist.
He said that when the incident happened, he instructed his office to set up a call with the Kremlin leader to say "we are ready for this negotiation to de-escalate. and unfortunately, until now, Putin did not answer my request for a direct phone conversation".
Republican Cindy Hyde-Smith wins Mississippi US Senate runoff amid racial controversies
Agriculture Secretary Mike Espy (D) by 56 percent to 44 percent with 76 percent of precincts reporting. Hyde-Smith and Espy emerged from a field of four candidates November 6 to advance to Tuesday's runoff.