you remember president biden renewed the new s.t.a.r.t. treaty in february this year, and this limits russia and the u.s. to 1,550 strategic nuclear warheads. but both russia and the u.s. have more than that and the concern is russia may have up to 2,000 short-range nuclear weapons that would be a concern for european countries, and like the u.s., russia also maintains strategic nuclear forces are ready to launch and this is concerning if nato, u.s. and russian forces come into close proximity in ukraine, then we have dangers of an accidental or preemptive launch. >> very concerning on all fronts. tariq rauf, thank you for your expertise. coming up next here this morning, as ukrainians flee their country in numbers not seen since world war ii, some are arriving in tijuana, mexico,