In an alarming tit-for-tat June 9, Taiwan's defense ministry said that several Chinese fighter jets briefly entered the country's air defense identification zone, and the US took the unusual move of flying a C-40A military transport plane over Taiwan. The US overflight was assailed by Beijing's Taiwan Affairs Office as "an illegal act and a seriously provocative incident." This comes as the US is deploying two aircraft carrier strike groups to the Pacific—the San Diego-based USS Nimitz and the Yokosuka-based USS Ronald Reagan. These join the USS Theodore Roosevelt, also based in San Diego but now patrolling the Philippine Sea near Guam. This marks the first time in three years that three US strike gorups have been simultaneously deployed to the Pacific, in what is being seen as an explicit warning to China. The triple deployment follows accusations by Lt. Gen. Kevin Schneider, commander of US forces in Japan, that China is using the coronavirus crisis as a cover to push territorial claims in the South China Sea. "Through the course of the COVID crisis we saw a surge of maritime activity," Schneider told Reuters. (The Hill, The Hill, USNI News, Reuters, AP)

Secretary of State Michael Pompeo announced on May 21 that the United States would formally submit notice the following day of its intent to withdraw from the Treaty on Open Skies, a post-Cold War trust-building measure signed in 1992 by the US, Russia and 33 other countries. The treaty, which took effect in 2002, allows each state-party to conduct unarmed reconnaissance flights over each others' entire territories to collect intelligence on military forces and activities. In accordance with Article XV, the US withdrawal will take effect six months after formally submitting notice. In a letter addressed to Pompeo, Defense Secretary Mark Esper and President Trump, Representatives Eliot Engel (D-NY) and Adam Smith (D-WA) protest that the withdrawal is in violation of Section 1234 of the Fiscal Year 2020 National Defense Authorization Act, which requires the president to notify Congress at least 120 days before giving formal notice of intent to withdraw from the treaty. (Jurist)