US Senator Chris Murphy believes that Serbian President Aleksandar Vucic is willing to recognize Kosovo but is angry over the 100 percent tariffs imposed by Pristina on goods from Serbia. Regional broadcaster N1 reported that Republican Senator Ron Johnson wrote on his blog about his recent visit to Belgrade, saying: ''We both believe that he (Vucic) is willing to strike a deal with Kosovo to recognize their independence, but right now, he is mad as a hornet over the 100% tariff.