The same verdict was handed down to the remaining three crew members on Tuesday in Kerch city where they are hospitalised following their injuries in the Russian air force attack on his ship on Sunday.
The Kerch Strait is the only passage between the two seas.
He said he hoped Berlin could intervene with Ukrainian authorities "to dissuade them from further reckless acts".
But in an interview with The Washington Post, Trump said, "Maybe I won't have the meeting".
Russia annexed the Crimean peninsula in March 2014, claiming its ethnic Russian majority was under threat from the Ukrainian government.
"I think we are at a crossroads", Xi said.
"I have asked the Secretary General of North Atlantic Treaty Organisation to increase the presence of the member-countries in the Black Sea, which includes air and naval presence".
Poland and Estonia's leadership have so far been seen to lead the calls for further, stronger sanctions on Russian Federation.
The European Union on Wednesday (Nov 28) strongly condemned Russia's seizure of three Ukrainian ships but, after three days of debate, member states failed to agree to threaten new sanctions.
Russian Federation and Ukraine blamed each other in the dispute that further ratcheted up tensions ever since Moscow annexed Crimea in 2014 and threw its weight behind separatists in eastern Ukraine with clandestine support, including troops and weapons. "We're going to see, depending on what comes out tonight".
The Moscow Times cites analysis by United Kingdom -based think tank Chatham House in reporting that the aggressive action is likely "simply the latest gambit in President Vladimir Putin's long game to chip away at his neighbor's economy to undermine the revolution that booted out its Kremlin-backed leader in 2014".
"Silent acknowledgment means de-facto recognition of the occupation of Crimea", she added.
The number of Russian units deployed along the Ukraine-Russian border has "grown dramatically" while the number of Russian tanks has tripled, Poroshenko said, citing intelligence reports but giving no precise timescale for the buildup.
Russia's President Vladimir Putin said the clash between Russian and Ukrainian military ships was a result of foreign nation's failing to hold Kiev accountable for bad behavior as long as it remains confrontational towards Russia.
President Recep Tayyip Erdoğan discussed tensions in the Kerch Strait near Crimea with his U.S. counterpart Donald Trump, Russian counterpart Vladimir Putin and Ukrainian counterpart Petro Poroshenko in separate phone calls and emphasized the importance of a diplomatic solution to tensions between the two neighbors, a Turkish presidency source said Wednesday. The message: "Get out of Ukraine".
In Buenos Aires later this week, it's not yet clear what Western leaders will meet with Putin.