LONDON — Donald Trump is “frustrated” with Vladimir Putin’s irrational approach to peace talks aimed at ending the war in Ukraine, according to Nigel Farage, the British politician who is closest to the U.S. president.  Farage said Trump was doing his best to secure a fair deal for Ukraine, adding that the current proposals for limits to the size of the Ukrainian armed forces and ceding territory to Russia were not acceptable.  “Putin proves with every week that goes by that he’s not rational,