Ukraine crisis updates: What to know as tensions rise
By VANESSA GERA
Associated Press
WARSAW, Poland (AP) — The U.S. says it has made no concessions to the main Russian demands over Ukraine and NATO in a long-awaited written response delivered to Russia on Wednesday in Moscow. The response comes as Russia has placed more than 100,000 troops near Ukraine’s border and ratcheted up war games in the region. Moscow denies it is planning an assault, but the United States and its NATO allies fear that Russia is planning for war and are also preparing for one. Russia increased its pressure Wednesday by saying it would quickly take “retaliatory measures” if the U.S. and its allies rejected its security demands. Ukrainian officials are seeking to calm nerves.