Carl Bildt, former Prime Minister and Foreign Minister of Sweden, shares his perspective from Europe:

What are the Russians up to with Ukraine?

Well, we don't know. But what we do know is that they are concentrating quite substantial military forces, moving towards the borders with Ukraine at the same time as they are de facto stopping the diplomatic dialogue with them. Very strong message coming from Washington and from the European capitals that they should abstain from early military operation. But you never know. It is a fairly sort of worrying situation.