1/ The U.S. government formally accused Russia of committing war crimes in Ukraine – four weeks after Russia launched its invasion. Secretary of State Antony Blinken said in a statement that “based on information currently available, the U.S. government assesses that members of Russia’s forces have committed war crimes in Ukraine,” noting that many of the buildings Russian forces have targeted are “clearly identifiable as in-use by civilians” in Russian “in huge letters visible from the sky.” The International Criminal Court on March 1 opened an investigation into possible war crimes in Ukraine. (CNBC / Wall Street Journal / Politico / Washington Post)

2/ Putin’s press secretary refused to rule out the use of nuclear weapons in Ukraine. Dmitry Peskov said Putin would consider using nuclear weapons in the case of “an existential threat for our country,” adding that “Putin intends to make the world listen to and understand our concerns.” Peskov repeated Putin’s “main goals of the operation” are to “get rid of the military potential of Ukraine,” to ensure Ukraine is a “neutral country,” to get rid of “nationalist battalions,” for Ukraine to accept that Crimea is part of Russia, and to accept that the Moscow-backed separatist Ukrainian regions of Donetsk and Luhansk “are already independent states.” The Pentagon, meanwhile, called the remarks “dangerous,” saying that’s “not the way a responsible nuclear power should act.” Putin previously warned countries that interfere in Ukraine should be prepared to face “the consequences you have never seen in history.” (CNN / Washington Post)

3/ NATO will double its troop presence on the alliance’s eastern flank in response to Russia’s continuing war in Ukraine. Secretary General Jens Stoltenberg said the deployment will consist of four new battle groups in Bulgaria, Hungary, Romania, and Slovakia. NATO will also provide Ukraine with equipment to protect against chemical, nuclear, or biological weapons. Stoltenberg called on Russia to stop its “nuclear saber rattling,” saying the use of chemical, nuclear, or biological weapons would be a “blatant violation of international law” and would fundamentally change the nature of the conflict. (Politico / CNBC / New York Times / Washington Post / Axios / BBC)

4/ Russia’s climate envoy resigned and left the country, citing his opposition to Putin’s war in Ukraine. Anatoly Chubais is the highest-level official to quit s...