Russia Expected to Escalate War in Ukraine Soon

Russia Expected to Escalate War in Ukraine Soon | World Affairs Journal:
"That’s what a number of prominent experts think.
Andrii Parubii, the vice speaker of Ukraine’s Parliament and former national security adviser, stated on March 27th that there is a “high risk” of a “full-scale military operation” in the next few weeks. 
An expert team led by Wesley Clark, a retired US Army general and former NATO supreme allied commander, informed the Atlantic Council in Washington on March 30th that “Ukrainian forces expect [an] attack within the next 60 days.
...No one knows why.
Has Vladimir Putin been skittish about the risks involved?
Did he just make a mistake and fail to seize the best opportunity to attack—i.e., anytime in the first few months after the Maidan Revolution?
Or has he been developing fiendishly clever plans and sharpening his knives?  "