http://www.trust.org/item/20140304193150-ty5lp
Consistently often, was planned and notified well before Crimea crisis.
All these military games, military movements near border including Poland is just normal procedure in a volatile region, a lot of people seem to be scared which is quite absurd.
Warning shots were fired but things are not getting heated, was a cheeky attempt by Ukrainian 300 soldiers to gain some ground and get their Belbek airbase back, which gone nowhere so they went back.
Watching reports from Crimea itself everybody is reporting very calm environment. Ukrainian and Russian solders calmly chatting as if they're buddies. General rhetoric from Ukrainian military commanders is that things are calm and it's now entirely up to "politicians". So I very much doubt things are going to heat up from this point but of course things can rapidly change.
Edit:
Quite interesting video of the warning shot incident:
https://www.youtube.com/watch?v=TRvdmmwoeQE
Interestingly enough western media portrayed the even much more calm and civil than it actually was even though they were present during the whole ordeal. Western sources I read also never showed Ukrainian soldiers say the following (which this video does show):
"Shoot B****"
"You're on live TV"
"America is with us"