Instead of showing solidarity and gaining the trust of his allies at a time when the existence of states in Europe is threatened, the Turkish president is breaking away from NATO's community of destiny.

Because Erdogan has recognized that he can use the planned accession of Finland and Sweden in several fields.

A foreign policy motive for his blockade could be to show Putin that Ankara is at least making NATO expansion more difficult.

Turkey is more dependent on Russia than most countries in Europe.

Another possible motive is to negotiate concessions with America on the delivery of the F-16 fighter jet.

That could, however, harden the political fronts in Washington.

On the other hand, Erdogan's threatening gestures should make an impression on the home audience.

There are increasing signs that he could call new elections.

He is using NATO expansion to present himself as a strong world leader to voters suffering from the economic crisis.

He also brings the state apparatus behind him, in which the PKK and its Syrian sister organization YPG mobilize more than any other issue.

Erdogan, who would rather use the crowbar in public than settle a dispute quietly, is apparently unaware that he is losing his international credibility in this way.