By Emma Farge and Mrinalika Roy GENEVA (Reuters) -The World Health Organization’s European head said on Thursday that the body was preparing for possible “chemical assaults” in Ukraine, in a sign it is taking warnings that have emerged from both the West and Moscow seriously. “Given the uncertainties of the current situation, there are no assurances that the war will not get worse,” Hans Kluge, WHO regional director for Europe, said during a briefing from Lviv, Ukraine. “WHO is considering all scenarios and making contingencies for different situations that could afflict the people of Ukraine,…