Warren Buffett's son Howard has given $500M to Ukraine — he warns the US is making a historic mistake by pulling its support

• Business Insider interviewed Warren Buffett's son about his  support for Ukraine. 
• Howard Buffett's foundation has given $520 million to Ukraine in humanitarian aid.
• The philanthropist warns the US will make a historic blunder if it fails to support Ukraine's war effort.

Two years after Russia's full-scale invasion of Ukraine, the embattled nation needs its friends more than ever.