As the Russia-Ukraine war enters its 399th day, we take a look at the main developments.Here is the situation as it stands on Wednesday, March 29, 2023: The United States and Russia have stopped sharing biannual nuclear weapons data under the faltering New START arms control treaty.The US says it had not seen any indications that Russian President Vladimir Putin was preparing to use tactical nuclear weapons in the Russian war on Ukraine, days after Putin said he was moving such weapons into Belarus.
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