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president biden gives ukraine's fighters a sky high advantage. >> we have ukraine's back. >> but after scrapping part of his world trip for debt ceiling talks, is the u.s. on shaky ground on the world stage? national security adviser jake sullivan joins me exclusively from japan. plus go time. president trump readies himself for his biggest gop challenger yet. >> it is easy to be a front-runner and harder to dig in. >> reporter: as the field expands will any crack trump's hold on the party? hello. i'm jake tapper in washington where the state of our union is kareening toward the ...

Weapons. in february thon show you would not say whether the u.s. would support ukrainian efforts to recapture crimea. that is one of the concerns that has been expressed about whether or not the ukrainians are given the ability to hit russian targets in crimea. do you think that crimea is part of ukraine? >> of course. >> so what would be the objection -- >> crimea is ukraine. that is a very straight forward thing. >> yeah. you answered it directly. russia doesn't think so, obviously. but do you think ukraine should have weapons that can reach russian targets in crimea? >> yes. we have not pl...