In the 21st century, nations cannot; and we cannot allow them to redraw borders by force. These are the ground rules. And if we fail to uphold them, we will rue the day. Russia has violated these ground rules and continues to violate them. Today Russia is occupying sovereign Ukrainian territory. Let me be crystal clear: The United States does not, will not, never will recognize Russia's attempt to annex the Crimea. (Applause.) It's that saying — that simple. There is no justification.
Remarks by Vice President Joe Biden to The Ukrainian Rada (9 December 2015).
Remarks by Vice President Joe Biden to The Ukrainian Rada | whitehouse.gov[obamawhitehouse.archives.gov]