In 2016, when his company was negotiating a potential deal in Moscow, Donald J. Trump suggested that there was no need for the United States to penalize Russia over Crimea.
https://www.nytimes.com/2018/11/29/us/politics/trump-cohen-russia-sanctions.html
https://112.ua/statji/sammit-g20-bitva-ukrainy-za-novye-sankcii-protiv-rossii-471558.html
http://www.kasparov.ru/material.php?id=5BFFCFE7E54F4
https://www.gazeta.ru/business/2018/11/29/12077107.shtml
https://www.kommersant.ru/doc/3813161
https://www.kommersant.ru/doc/3812874
https://www.kommersant.ru/doc/3813460
https://nv.ua/opinion/otul/podozhdite-s-sanktsijami-protiv-rf-2510121.html