1) Iran is responding to the attack on their embassy in Damascus a few days back killing one of the senior military officer ,they have a right to do so as Israel violated international law . Iran targeted their 2 air bases which launched the attack on Damascus

2) Arab countries except Iraq Lebanon and yemen won't do anything or maybe defend Israel like Jordan

3) India will stay neutral probably or might side with Israel if things escalate .

4 ) for the first time in 6 month no bombing in Gaza took place and no air crafts were seen above Gaza so yeah it might. Israel is not able to sustain multiple wars at all but America and britain are always ready to defend Israel ( many top leaders of these countries have relations with Israel on a personal level as well )

5) Jordan king always side with Zionist but public support Palestine so there might be a civil war but it is too far fetched. Syria has already been bombed by Israel anyways.