Russia and Ukraine discussed further prisoner swaps on Wednesday at a brief session of peace talks in Istanbul, but the sides remained far apart on ceasefire terms and a possible meeting of their leaders.

More: Russia expels six British diplomats as tensions rise over Ukraine missiles He said that Moscow could either resort to nuclear weapons in the end, or use some of its non-nuclear but still ...

While Russia, the U.S. and NATO allies talk about the future of Ukraine this week, Ukrainians contemplate the threat of further Russian invasion, and whether the West will have their backs.