moscow u.s. decision supply weapons ukraine dangerous encourage kiev use force eastern ukraine russian officials say saturday u.s. state department say friday unite state would provide ukraine enhance defensive capabilities kiev battle russian-backed separatists eastern part country u.s. officials speak condition anonymity say weapons include javelin anti-tank missiles washington argue past weapons would help stabilize situation effectively use take territory ukrainian president petro poroshenko say facebook saturday weapons would use protect ukrainian soldier civilians supply weapons encourage support conflict ukraine use force scenario russia ria state news agency cite deputy foreign minister grigory karasin say saturday franz klintsevich member upper house russian parliament security committee say kiev would consider arm supply support action interfax news agency report americans fact directly push ukrainian force war klintsevich say since moscow annexation crimea 2014 ukraine russia loggerheads war eastern ukraine pro-russian separatists ukrainian government force kill 10,000 people three years poroshenko say facebook post confirm weapons deal u.s. secretary state rex tillerson call transatlantic vaccination russian virus aggression american weapons hand ukrainian soldier offensive strong rebuff aggressor protection ukrainian soldier civilians well effective self-defense accordance article 51 un charter poroshenko say kiev accuse moscow send troop heavy weapons region russia deny russian foreign ministry say u.s. decision undermine minsk agreements tass state news agency report saturday agreements intend end fight ukraine sign ukraine russia germany france belarussian capital early 2015. moscow u.s. arm may spur use force kiev eastern ukraine