Ukraine’s top general says the situation in the northern Kharkiv region has “significantly worsened” after Russia claimed to have captured four further villages as it expanded its surprise cross-border offensive. A Ukrainian regional official insisted Russia’s progress was not yet “significant” but admitted ground fighting in the area was spreading. Meanwhile, speaking on British television, UK Foreign Secretary David Cameron acknowledged it was an “extremely dangerous moment,” adding that Russia had effectively “invaded [Ukraine] again.” The precise goal of Russia’s new push – which began in the early hours of Friday morning – is unclear. It may be to create...