Watch how U.S. President Donald Trump and Democratic Republic of Korea leader Kim Jong Un spoke about each other over the years.

See how their relationship changed from animosity to friendship.

Great meeting and dinner with Kim Jong Un in Hanoi, Vietnam tonight. Looking forward to continuing our discussions tomorrow! #HanoiSummit pic.twitter.com/J3x6lUGzjS

— Donald J. Trump (@realDonaldTrump) February 27, 2019

Kim Jong Un of North Korea proclaims “unwavering faith in President Trump.” Thank you to Chairman Kim. We will get it done together!

— Donald J. Trump (@realDonaldTrump) September 6, 2018

Possible progress being made in talks with North Korea. For the first time in many years, a serious effort is being made by all parties concerned. The World is watching and waiting! May be false hope, but the U.S. is ready to go hard in either direction!

— Donald J. Trump (@realDonaldTrump) March 6, 2018

North Korean Leader Kim Jong Un just stated that the “Nuclear Button is on his desk at all times.” Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!

— Donald J. Trump (@realDonaldTrump) January 3, 2018

Why would Kim Jong-un insult me by calling me "old," when I would NEVER call him "short and fat?" Oh well, I try so hard to be his friend – and maybe someday that will happen!

— Donald J. Trump (@realDonaldTrump) November 12, 2017

North Korea just stated that it is in the final stages of developing a nuclear weapon capable of reaching parts of the U.S. It won't happen!

— Donald J. Trump (@realDonaldTrump) January 2, 2017