As reported by Censor.NET, this was said by Kurt Volker, the Trump administration's special envoy charged with ending the war in Ukraine, in an interview for Politico.
"We don't accept Russia's invasion and occupation of Crimea. But if we can make progress on the other one, on the Donbas, we should do it," the ambassador said.
Volker stressed that he brought up Crimea issue at each meeting with Russian president's aide Surkov but was always told: "We will not going to talk about Crimea."
Asked whether future generations will be looking at a map of the Crimean peninsula that includes it in Russia, the U.S. special envoy said: "No. It's going to be like when I was growing up and the Baltic states were with asterisk saying that the United States does not recognize forcible incorporation of Estonia, Latvia, and Lithuania into the territory of the USSR. I think its going to be maps like that."
Volker earlier said that the prospects for peace in the Donbas were so dim he reckoned it was very likely that active fighting would continue for another year.