In his remarks in Buenos Aires, Putin appeared to confirm some of Kiev's claims, conceding that the Ukrainian and Russian vessels had been in contact with each other before the incident, and that the Ukrainians had refused to use a Russian pilot to help them navigate the narrow strait.
President Donald Trump was only a half-hour into his nine-hour flight to the G20 summit here in the Argentine capital when he chose to pull the plug on the most hotly anticipated moment of his trip: a lengthy face-to-face with Russian President Vladimir Putin.
"If the domestic situation and the pressure from Russophobes like Ukraine and its sponsors prevents the USA 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".
Friday will amount to the President's busiest day of diplomacy, but his most important meeting of the summit - his dinner with Chinese President Xi Jinping - doesn't come until a day later.
He added: "The President wanted to send a clear, unambiguous message that we find that type of behaviour unacceptable, so we cancelled the meeting".
One bright spot in Buenos Aires on Friday before the summit opened was the signing of a revised US-Mexico-Canada trade pact to replace the North American Free Trade Agreement (Nafta).
A White House official responded to questions centering around a report that a canceled meeting between Trump and Putin may still occur. If we could make a deal that would be good.
Saudi Arabia has said the prince had no prior knowledge of the murder. But on Thursday evening, an official with the Canadian Prime Minister said Trudeau would be at Friday's ceremony. Trump will have a more formal meeting with Abe in the afternoon, where they'll be joined by Indian Prime Minister Narendra Modi.
He confirmed that Russia's aggression against Ukraine was the sole reason for the cancelation and called suggestions that Trump's decision was influenced by developments in the special counsel Robert Mueller probe "ludicrous".
Putin's wish list is topped by a desire to see an end to crippling anti-Russian sanctions imposed by the USA and its allies for Russia's annexation of Ukraine's Crimean Peninsula, its support for separatist insurgents in eastern Ukraine and other actions by Moscow.
'Frankly, in light of what happened with Ukraine with the ships and the sailors, it just wouldn't be the right time, but I will meet with him.
'I don't know, ' he said.