and he goes there openly claims "we have no strategy yet" for fighting isis, and i bet he also has no clue what he should do against russia, while in europe it's consensus that all those "harsh" economical sanctions won't stop putin because he has a brain too and has included these sanctions already in his gain/lose calculations.
What do you suggest doing against ISIS?
Bombing them back to the dawn of the universe? Oh wait that'll just get rid of the current group. In a couple of years another one will form that's either just as bad or worse. Then what do you do then? Bomb them? And so on? Not like that's difficult, we have an entire carrier battle group that's in the middle east and can easily bomb Iraq, Syria and various other countries and wipe them of the face of the earth. But that will only be a short term solution and they will, likely, use the bombings to their advantage.
Now I will agree that as a short term measure something needs to be done about ISIS, things like bombing them (but in a strategic way, not just carpet bomb cities), destroying their bases but there also needs to be a significant long term plan in place to make sure groups like them can never exist again. Just keeping troops in Iraq/Syria will not help that long term plan at all, instead it usually has the opposite effect of making people hate their "occupiers" even more. The other problem is the collateral damage from bombing; everytime an innocent person dies because of a drone or a bomb that the US dropped there is going to be a family member who now starts to hate the US (or the west) and they become easily swayed by terrorist propaganda and so the cycle repeats itself again and again.
The problem with groups like ISIS is that their goal is terror. They get what they want by spreading terror and so defeating what is essentially a philosophy is extremely difficult. This isn't some sort of conventional army that you can bomb and conquer. The US (and the rest of the world) has to destroy the ideology that drives their members.
Really the ONLY tool we have to fight terror is education, and we need significantly greater strides in that area.