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US President Donald Trump says he may cancel a meeting with Russian President Vladimir Putin following a maritime clash between Russia and Ukraine.

Mr Trump told the Washington Post he was waiting for a "full report" after Russian ships fired on and seized three Ukrainian boats on Sunday, BBC reported.

"Maybe I won't have the meeting [with Mr Putin]. Maybe I won't even have the meeting. I don't like that aggression. I don't want that aggression at all," he said.

The two leaders are due to meet on the sidelines of the G20 summit in Buenos Aires later this week.
The two men are scheduled to discuss security, arms control, and issues in Ukraine and the Middle East when the summit convenes on Friday and Saturday, national security adviser John Bolton told reporters.
Meanwhile, the US has urged European states to do more to support Ukraine.

State department spokeswoman Heather Nauert said Washington wanted to see tougher enforcement of sanctions against Russia.

Russian coastguard ships opened fire on Sunday as the two Ukrainian gunboats and a tug sailed through the Kerch Strait off the coast of Crimea, which was annexed by Russia in 2014. Twenty-four Ukrainians were detained and at least three were wounded in the incident.

Ukraine described it as an "act of aggression" but Russia said the ships had illegally entered its waters.
A Crimean court later ordered that 12 of the Ukrainians be detained for 60 days. The court is expected to issue rulings for the remaining servicemen on Wednesday.

The head of Ukraine's SBU security service, Vasyl Hrytsak, confirmed Russian reports that members of the service were on board the boats, but added that it was a "routine counter-intelligence mission" of a type that the Russian navy carried out regularly.

On Tuesday, President Petro Poroshenko said there was a threat of "full-scale war" with Russia.
"The number of [Russian] tanks at bases located along our border has grown three times," he said.
On Monday night, Ukraine's parliament backed President Poroshenko's decision to impose martial law for a 30-day period from 26 November in 10 border regions.