With the threat of a possible nuclear standoff growing, Martha Raddatz reports onboard a U.S. Navy ballistic missile submarine and explores how the most destructive warships ever built are helping keep Americans safe. Then, with the $40B Ukraine aid package en route to Asia for Biden's signature, Martha interviews Adm. Mike Mullen on the latest on the war, Finland & Sweden joining NATO & concerns of a provocation from North Korea this weekend.

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