Vietnam's Communist Party leaders warn of challenges ahead

Vietnam Communist Party General Secretary Nguyen Phu Trong delivers a speech during the opening of 13th Communist Party Congress in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (An Van Dang/VNA via AP)

Vietnam's Defense Minister Ngo Xuan Lich, left, arrives for the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam, Tuesday, Jan. 26, 2021. (AP Photo/Minh Hoang)

Delegates attend the opening of 13th Communist Party Congress in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (Bui Lam Khanh/VNA via AP)

Vietnam Prime Minister Nguyen Xuan Phuc delivers a speech during the opening of 13th Communist Party Congress in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (Bui Doan Tan/VNA via AP)

Delegates attend the opening of 13th Communist Party Congress in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (An Van Dang/VNA via AP)

Vietnam's Prime Minister Nguyen Xuan Phuc, second left, arrives for the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam Tuesday, Jan. 26, 2021. (AP Photo/Minh Hoang)

Vietnam Prime Minister Nguyen Xuan Phuc, second left, arrives at the national convention center to attend the 13th Communist Party Congress in Hanoi, Vietnam Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (AP Photo/Minh Hoang)

A journalist sitting at the media center watches Nguyen Phu Trong, general secretary of the Communist Party of Vietnam delivering a speech, on screen, during the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (AP Photo/Minh Hoang)

Nguyen Van Nen, center, secretary of the Ho Chi Minh City Party Committee arrives for the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam Tuesday, Jan. 26, 2021. (AP Photo/Minh Hoang)

Delegates arrive at the national convention center to attend the 13th Communist Party Congress in Hanoi, Vietnam Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (AP Photo/Minh Hoang)

Former Vietnam's Prime Minister Nguyen Tan Dung, second right, arrives for the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam, Tuesday, Jan. 26, 2021. (AP Photo/Minh Hoang)

Journalists, sitting at the media center, watch Nguyen Phu Trong, General Secretary of the Communist Party of Vietnam delivering a speech, on screens, during the opening ceremony of the 13th National Congress of Vietnam's Communist Party (VCP), in Hanoi, Vietnam on Tuesday, Jan. 26, 2021. Vietnam's ruling Communist Party has begun a crucial weeklong meeting in the capital Hanoi to set the nation's path for the next five years and appoint the country's top leaders. (AP Photo/Minh Hoang)