Hong Kong activist Joshua Wong and three others pleaded guilty on April 30 to charges related to their participation in last year's June 4 vigil commemorating the Tiananmen Square massacre. Wong, one of the city's most prominent pro-democracy advocates, is already serving a term of 17 months in prison. Last December, he was sentenced to 13 months imprisonment for organizing an illegal assembly during the height of the 2019 anti-government protests. This sentence was extended by four months on April 13 after Wong pleaded guilty to fresh charges of unauthorized assembly and violating an anti-mask law.

Human Rights Watch on April 27 issued a report accusing Israeli authorities of crimes against humanity, specifically those of apartheid and persecution, targeting the Palestinian people. The report charges that there is "an overarching Israeli government policy" to mitigate what authorities have openly described as a "demographic threat" from Palestinians. The 213-page report, A Threshold Crossed: Israeli Authorities and the Crimes of Apartheid and Persecution, cites the 1973 International Convention on the Suppression and Punishment of the Crime of Apartheid  and the 1998 Rome Statute of the International Criminal Court. 

A rally in Tokyo on April 22 highlighted opposition to a proposed immigration law currently under consideration in Japan's National Diet, seen as a yet further tightening of the country's already highly selective refugee system. The rally, under the slogan "Open the Gate for All," was organized by opposition lawmakers and human rights organizations including Amnesty International Japan and the Solidarity Network with Migrants Japan, all seeking to halt the legislation currently under consideration in the Diet. The proposed reform would permit asylum-seekers to be deported after a third failed application, and introduce new procedures for forcible deportation of individuals who entered Japan illegally or overstayed their visas. As the bill includes no cap on the length of detention or judicial review of cases, it has been criticized by human rights experts at the United Nations.

Syria was stripped of its voting rights at the Organization for the Prohibition of Chemical Weapons (OPCW) on April 21, after recent findings evidenced the regime's use of poisonous gas throughout the nation's civil war. A two-thirds majority of nations voted to strip the Bashar Assad regime of its rights and privileges as a member of the organization, including the right to vote at OPCW conferences. The OPCW, monitoring body for the 1997 Chemical Weapons Convention, has 193 members, 87 of whom voted in favor of suspension of Syria's rights. Out of the 136 countries participating in the Conference of State Parties where the vote was taken, 34 states abstained and 15 voted against, including Russia, Iran and Syria.

President Joe Biden announced April 22 at the Leaders Summit on Climate that the US will aim to reduce carbon emissions by 50 to 52 percent by 2030. Climate experts have urged world leaders to cut carbon emissions in order to limit the warming of the planet to 1.5 degrees Celsius. Scientific research has shown that warming beyond that level could result in significantly greater climate impacts, including increased droughts, lower water availability, and disruption of biodiversity and ecosystems. "The United States isn't waiting. We are resolving to take action—not only our federal government, but our cities and our states all across our country; small businesses, large businesses, large corporations; American workers in every field," Biden said at the online summit, which was held on Earth Day.

Former deputy prime minister and current leader of Italy's right-wing League party Matteo Salvini must stand trial for kidnapping, a Palermo judge ruled April 17. The charges concern an incident in August 2019 in which he barred 147 migrants who had been rescued by Barcelona-based NGO Open Arms from disembarking at a Sicilian port. An indictment of the former minister was requested by prosecutor Francesco Lo Voi as well as 23 civil parties acting as representatives of Open Arms. A civil action was also filed by nine migrants who were on board the vessel, which had been blocked for 19 days off the coast of Lampedusa.

The Biden administration's Army Corps of Engineers on April 9 indicated at a federal court hearing that they would not stop the flow of oil through the Dakota Access Pipeline (DAPL) despite the threat it poses to the Standing Rock Sioux Tribe's water supply. The project is currently operating without a federal permit as the matter is contested in the courts.

Turkish prosecutors on April 5 issued arrest warrants for 10 retired senior navy officers a day after 104 officers released a letter defending the Montreux Doctrine. The Montreux Doctrine is an agreement made in 1936 concerning critical waterways that run through Turkey, most notably the straits of the Bosphorus (also known as Strait of Istanbul) and the Dardanelles. The terms of the international convention provide that Turkey may control the straits, but must permit civilian vessels to pass through the waterways in times of peace. In addition, the treaty regulates passage of warships and foreign cargo ships on the waters. The treaty was designed to "prevent the militarization of the Black Sea."