A major leak of classified U.S. documents has been exposed, containing sensitive and highly classified material, including details of Ukrainian agents pursuing drone attacks inside Belarus and Russia. John Bolton, former national security adviser to President Donald Trump, has warned that the documents may be doctored or fabricated, and the leak has caused some allied nations to reconsider their support for Kyiv. The impact of the leak on U.S. relations with Ukraine and other countries is yet to be seen.