Mikado,
Although Ukraine jumped in on those messages and even John Kerry took those social network and tapped phones as verified intelligence most news organizations realized that they were not verifiable and wouldn't be accepted as evidence.
Most of the accounts now use words such as alleged instead of confirmed. Fog of War.
The point remains that these events are accidental and shouldn't be used as a way of defining and punishing enemies.
The USA never apologized for the Iranian airline that they accidentally shot down July 1988. 290 men women and children were killed.
The USA and Europe punish Russia for the accidental deaths in the midst of a war zone but ignore the reckless bombardment of civilians in heavily populated areas of East Ukraine resulting in close to 900 deaths so far.
Obama sends the USA airforce to rescue innocents in Iraq while he turns his head when his Ukranian buddies have surrounded cities with populations in hundreds of thousands depriving them of food, water, and electricity to even run their hospitals.
Then the head of NATO warns that if Russia tries to end the fighting by force it will be considered an invasion.
At this point the people in East Ukraine will never trust or forgive the Ukranian army for destroying their homes, schools , clinics etc. Especially when Ukraine is so broke it will be a long time before it has any money to rebuild that area.
Why doesn't the US call off the Ukrainian goons and move the whole thing to the bargaining table where it will no doubt end up.
Obama is just trying to act as tough as John McCain in the face of midterm elections.