The S-400 "Triumph" is Russia's latest and most advanced anti-aircraft and missile defense system.
Putin insisted that the Russian border guards were acting in line with the usual protocol when they made a decision to fire on the Ukrainian ships.
Putin's claim that the Ukrainian vessels had illegally crossed into Russian waters was echoed by Russian Foreign Minister Sergey Lavrov. The rest are to appear in court on Wednesday, November 28.
In Ukraine, Poroshenko on Wednesday toured a military training center in the Chernihiv region, which borders Russian Federation and is one of the areas where martial law was imposed.
On Monday, Ukraine's government announced that it would declare martial law in 10 of the regions that are believed to be at risk of a Russian military invasion.
The Kremlin said it expected the meeting to take place and played down the threat, with Putin's foreign policy advisor Yuri Ushakov saying: "The meeting is equally needed by both sides".
In an interview with The Washington Post Tuesday, Trump says he will be receiving a "full report" from his national security team.
"Europe shouldn't like that aggression, and Germany shouldn't like that aggression", Trump said.
Turkish President Recep Tayyip Erdogan Wednesday held phone conversations with his Russian and Ukrainian counterparts over the recent tension between the countries in the Black Sea, according to Turkish presidential sources.
Western leaders have faced criticism for what some observers have said was a slow, stumbling response to the developing crisis in Kerch, with tweeted statements of condemnation and concern standing as the only western response for nearly two days.
The strait is the only route for ships traveling between the Black Sea and the Sea of Azov, where Ukraine has several ports.
The U.S. special envoy for Ukraine, Ken Volker, told reporters in Berlin Wednesday he believes Kyiv's account that its ships were operating within global maritime rules. They later emerged on Russian television confessing that the Ukrainians had been provocative, but officials in Kiev said that the men had been forced to lie.
"In the case of Russian attack for the Azov shore we are not just prepared to act militarily, we will fight for our independence, for our territory and our freedom", he said.
Ukraine has also blamed the Kremlin for separatist violence in eastern Ukraine, near the border with Russian Federation. "It is introduced with the sole goal of boosting Ukraine's defense in the light of a growing aggression from Russian Federation".