Sihamoni was crowned Cambodia's king in 2004 after his father Sihanouk's abdication. During the late 1990s and early 2000s, reconstruction efforts progressed which led to some political stability through a multiparty democracy under a constitutional monarchy although Sen's rule has been marred by human rights abuses and corruption. Cambodia's economy grew rapidly in the 2000s and 2010s, and it received considerable investment and infrastructure development support from China as part of its Belt and Road Initiative.A UN-backed war crimes tribunal, the Khmer Rouge Tribunal sought out to investigate crimes committed during the Democratic Kampuchea period and prosecute its leaders. However, Hun Sen has opposed extensive trials or investigations of former Khmer Rouge officials. In July 2010, Kang Kek Iew was the first Khmer Rouge member found guilty of war crimes and crimes against humanity in his role as the former commandant of the S21 extermination camp and he was sentenced to life in prison. In August 2014, the tribunal sentenced Khieu Samphan, the regime's 83-year-old former head of state, and Nuon Chea, its 88-year-old chief ideologue, to life in prison on war crimes charges for their role in the country's terror period in the 1970s. After the 2013 Cambodian general election, allegations of voter fraud from opposition party Cambodia National Rescue Party led to widespread anti-government protests that continued into the following year. The protests ended after a crackdown by government forces. The Cambodia National Rescue Party was dissolved ahead of the 2018 Cambodian general election and the ruling Cambodian People's Party also enacted tighter curbs on mass media. The CPP won every seat in the National Assembly without a major opposition, effectively solidifying de facto one-party rule in the country. The global COVID-19 pandemic spread to Cambodia in early 2020. Despite minimising the disease's spread for much of 2020 the country's health system was put under strain by a major outbreak in early 2021, which prompted several lockdowns. It also had a severe economic impact, with the tourism industry particularly affected due to international travel restrictions. Prime Minister Hun Sen, who assumed office and is one of the world’s longest-serving leaders, has a very firm grip on power. He has been accused of crackdowns on opponents and critics. In December 2021, Hun Sen announced his support for his son Hun Manet to succeed him after the next general election in 2023. The CPP confirmed Manet as its future candidate