The US isn't the only country considering a military response to Iranian aggression.
United Nations Security Council members listen to Iranian Deputy Ambassador to the United Nations Eshagh Al-Habib, left, during a meeting on Iran’s compliance with the 2015 nuclear agreement, Dec. 12, 2018, at UN headquarters.
AP Photo/Mary Altaffer
Iran's leaders are threatening to breach a 2015 agreement that froze their country's nuclear program. What is uranium enrichment, and what would it mean for Iran's ability to build nuclear weapons?
After years of work, the JCPOA nuclear deal could be on its last legs.
Pedestrians in Tokyo pass a television screen broadcasting a report on May 4, 2019 that North Korea has fired several unidentified short-range projectiles into the sea off its eastern coast.
AP Photo/Koji Sasahara
North Korea is a major military threat to the US and its Asian allies, but exactly how powerful are its nuclear weapons? An earth scientist explains why it's hard to answer this question.
History shows that diplomacy takes time and many incremental steps forward, a diplomacy expert writes.
St Peter’s Square, 2014. The Pope benefits from a wide popularity especially in Europe, but does it really influence people’ decisions on political issues?
Alfredo Borba/Wikimedia
Pope Francis has been a staunch voice for a world free of nuclear weapons. But should he be involved in defence politics at all? And how does the Pope's message resonate among the European public?
Saudi Arabia has many possible motives for pursuing nuclear power.
TTstudio/Shutterstock.com
Exporting nuclear technology is lucrative, but without strict safeguards, buyers could divert it into bomb programs. Why is Saudi Arabia shopping for nuclear power, and should the US provide it?
Donald Trump meets with Kim Jong Un in Singapore, 2018.
AP Photo/Evan Vucci
Relying only on sanctions against North Korea may not be a productive way to get the country to give up its nuclear arms. Offering relief and aid may be more effective.
Russian President Vladimir Putin, left, speaks to Defense Minister Sergei Shoigu.
Alexei Nikolsky, Sputnik, Kremlin Pool Photo via AP
Australian scientist Mark Oliphant helped push the development of nuclear weapons during World War II but later riled at US attempts to keep the UK and others out of the nuclear arms race.