Most wars you hear of today are somehow linked to terrorism and state sponsored terrorism for the sake of some political agenda. Are there still any wars remaining between sovereign states?. If not, what was the last war of this kind?
Even ignoring the terrorism question, this is hard to answer because official declarations of war don't happen so much recently.
Russia vs Georgia in 2008 was definitely a war by most standards, with regular army units fighting each other.
In 2016 there were four days of fighting on the Armenia Azerbaijan front. Officially this war never ended.
But then neither did the Korean war, and there were sporadic incidents in that as well in recent times.