The People of Greece being fed up with austerity in their country have chosen their elected officials in free and fair elections. Those now in the Greek Government are taking a more confrontational role with their creditors in the international community. My guess is that many in the international community wish they could do a regime change in Greece and get a more conciliatory government in place that will abide by its debt obligations.
Compare Greece with Egypt where a few years ago the Egyptian people voted for Morsi (for good or bad) in reasonably free and fair elections but were eventually denied the government of their choice when the Western powers favoured General Sisi as their preferred leader and a change in government took place.
The Greek people will probably be allowed to keep their government. Unless their financial situation becomes too dire then they themselves will call for new elections. We are used to hearing about regime change in South America or Middle Eastern countries. What constitutes regime change? Does a foreign government trying to get MPs to vote against their government in a no confidence vote, for example, constitute regime change? Would regime change be orchestrated in an EU country?