U.S. citizens travel to Ukraine to help in war efforts: "Ukrainians have inspired the world"

The number of international fighters helping Ukraine is growing every day. The Ukrainian government reports more than 16,000 foreigners have already arrived, including some Americans.

Andriy Penchak is an American licensed truck driver who was born in Ukraine. He landed with three other Americans ready to go into the war zone. He told "CBS Mornings" co-anchor Tony Dokoupil that he wanted to save the lives of the Ukrainians still inside the country.

He launched this mission from Bucks County, Pennsylvania. He's never been to battle and used personal savings to pay for his plane tickets.