Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

A woman takes pictures of sunflower fields in Odessa, Ukraine, July 9, 2019. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)

Photo taken on July 9, 2019 shows sunflower fields in Odessa, Ukraine. The annual export of sunflower oil from Ukraine reaches 5 million tons, worth four billion U.S. dollars, according to statistics from Ukraine authorities. (Xinhua/Chen Junfeng)