The situation is very serious. We cannot afford to lose Kharkiv, Ukrainian President Volodymyr Zelensky said in an interview with ABC News.Hundreds of people have been killed or injured in the past few days, he said. Many of them were soldiers from the region, so it was important for him to be there and support them, he said.The Ukrainian president also responded to a question about whether the US is to blame for what is happening in Kharkiv now.It is the fault of the whole world. They gave Putin the opportunity to carry out the occupation. But now the world can help," Zelensky replied.According to him, all Kyiv needs is two Patriot systems."Russia will not be able to occupy Kharkiv if we have them," Zelensky said.