Western sanctions against Russia have failed, Crosetto said, adding that "we can only resolve this crisis by involving everyone: first with a truce and then with peace."While Crosetto's remarks went further, Ukrainian officials have also said in recent days that an outright Ukrainian victory on the battlefield is unlikely. Vadym Skibitsky, deputy head of Ukraine's military intelligence, told the Economist earlier in May that wars such as Russia's full-scale invasion "can only end in treaties."Ukraine will hold a peace summit in Switzerland in June, presidential spokesperson Sergii Nykyforov said on May 2. After the summit, participants will formulate a common negotiating position on the end of the war and submit it to Russia. The Swiss government said Russia will not be invited "at this stage" of the talks.