nbc's andrea mitchell went to yukon, oklahoma, home of garth brooks to see how america's farmers are uniting to help themselves by helping ukraine. >> reporter: yukon, oklahoma, known for wheat fields and cattle ranches, nearly 6,000 miles from the battlefields of ukraine, but people in both places may have more in common than they think. >> why are you traveling across the country talking to farmers about ukraine. >> what happens in ukraine is going to have a huge impact on what happens to this country. >> reporter: ukraine once a top grain exporter before the war, known as the breadbasket of europe, fields littered with land mines, exports plummeting, farmers livelihoods destroyed, and populations from egypt to south africa scrambling for grain. we joined illinois farmer and agricultural philanthropist howard buffett on a third stop of the tour across the u.s., bringing the light of ukraine's farmer to the america heartland, buffet t has one goal to convince farmers here to support farmers over there. >> if ukraine falls to russia, there's no other logical conclusion other than nat