'changes in regime' is correct and usable in written English.
You can use it when referring to a change or shift in the governing body, structure, or political system of a country or organization. For example, "After the recent changes in regime, the economy has been improving significantly."
A change in regime has to have casualties.
But as Matthew Yglesias of The American Prospect puts it, the cosmetic change in regime had the effect of "Afghanizing" the media coverage of Iraq.
On Cuba, it is very possible that the next president would witness a change in regime there, simply by the passing of the current leader.
"Until we see a change in regime behaviour, thousands will continue to starve," said Gareth Bayley, the UK special envoy for Syria.
If military action begins, it will soon become evident that it is impossible to eliminate the weapons without a change in regime.
By the time I got back to the new town, the sun was quite high, and the streets were filling with people enjoying the small freedoms brought about by the change in regime.
They were eager to leave, in part, because Kublai was nearly 80, and his death (and the consequent change in regime) might have been dangerous for a small group of isolated foreigners.
"The basketball program is a disaster, but if you look at the regular sports and look at the performance before this change in regime, we were doing things the right way," he said.
Putin implies that the West stands behind regime-change in Ukraine: I think that this was all well-prepared, of course there are military units and they are there to this day, they are well-prepared and in this the Western instructors did well … Change in regime is probably necessary, but only in a legitimate manner according to the current constitution.
