The expert: Putin may not have decided yet

Fredrik Löjdquist, head of the Foreign Policy Institute's Center for Eastern European Studies, also agrees that the risk is imminent.

- It may be that Putin has not yet made a final decision.

But now you are ready for a major military attack should you need it.

Using this to try to strengthen its negotiating position looks like it was at an earlier stage, but we do not know, he says.