@Wetrix

That's a simple carrot and stick tactics. Russia has been bombing civilians to push them towards EU and saying "hey, just let us in and we'll bring order".

Rather than dealing with the source of the problem - being Assad and Putin - EU just paid Erdogan to keep the refugees in Turkey.

But this only encouraged these two to go even further, which is probably why Turkey started the offensive and opened the borders to let EU deal with the problem it's partially responsible for.