I've highlighted that last part because you made it up. The Ukrainian Govt. issued no such threats.
The first word you highlighted was "effectively", it has many uses, I.E if you say the coin did not land on heads you are effectively saying it landed on tails. When they new Ukrainian government declared that Crimea had no authority to hold a referendum on independence and sent the Ukrainian special forces to Crimea for "operations against the Crimean defence force" they were effectively declaring their intention to take back control of Crimea by force. (NB the Ukrainian special forces refused the order, but that doesn't change the fact it was given).