Vice President JD Vance remains confident the U.S. can broker an end to the war between Russia and Ukraine despite potential hang-ups that have emerged since President Donald Trump’s meeting this month with Russian President Vladimir Putin.“We believe we’ve already seen some significant concessions from both sides, just in the last few weeks,” Vance said in an exclusive interview on NBC News’ “Meet the Press.”“We’re going to eventually be successful, or we’ll hit a brick wall