By Aleksandar Vasovic KYIV (Reuters) – Ukrainian President Volodymyr Zelenskiy said on Tuesday Russia must call a halt to bombing Ukrainian cities before meaningful talks on a ceasefire could start, as a first round of negotiations this week had yielded scant progress. Speaking in an interview in a heavily guarded government compound, Zelenskiy urged NATO members to impose a no fly zone to stop the Russian airforce, saying it was a preventative measure and not meant to drag the alliance into war with Russia. Zelenskiy, who has refused offers to leave the Ukrainian capital as Russian forces adv…