WASHINGTON US Vice President JD Vance said Monday that giving Americans “economic upside” in the future of Ukraine will serve as the "very best" security guarantee. "If you want real security guarantees, if you want to actually ensure that (Russian President) Vladimir Putin does not invade Ukraine again, the very best security guarantee is to give Americans economic upside in the future of Ukraine," Vance told Fox News. "That is a way better security guarantee than 20,000 troops from some