Kyiv (AFP) – Ukraine vowed not to give ground at talks with Moscow on Sunday as Ukrainian forces resisted a Russian invasion four days in and Moscow put its nuclear forces on high alert. Fighting has claimed dozens of civilian lives, forced hundreds and thousands of Ukrainians to flee west and could, according to the EU, eventually displace up to seven million people. Russia has become an international pariah as its forces do battle on the streets of Ukraine’s cities, facing a barrage of sanctions including a ban from Western airspace and key financial networks. Ukraine said it had agreed to s…