The ROKN Sejong the Great and the JMSDF Kongo/Atago/Maya Classes are generally big enough to be considered to be cruisers. Seems no one want use that designation for some reason. I was saying Darling-Class were feeling bit..undergunned was they have less VLS tubes than most ships designated as Destroyers. There was jabbering about adding Strike size Mk41 VLS launchers on them, but i think as usual the budget won't allow it. Most European ocean going navies that employ guided missile ships have 32 tubes or more. Unless they Darlings some how reload.
Chinese are commissioning Destroyers, Type 055 which are shouting distance of Ticonderoga-Class CGs and Flight II Burke Class DDGs.
These pair of Type 055 were commissioned i think nearly same day. They're in need due to Carriers coming on line needing serious AA escorts.
I think only the first Type 055 has been commissioned. It was a simultaneous launching, but that means they're still in line for systems integration and sea trials before they'll actually be commissioned, so schedule it for another year and change.
As for the Corvette/Frigate/Destroyer/Cruiser separation, I'd argue that there hasn't been one since post-WW2. The interwar years saw destroyers grow into general-purpose surface combatants capable of independent operations - probably as a result of the naval treaties restricting the total numbers and aggregate tonnage of cruisers that would have previously taken that role.
Even in the inter-war years, there was some blurring between large destroyers and light cruisers with the French navy in particular pushing the treaty definitions to avoid the cruiser quota.
The French Mogador-class had a standard displacement of about 3000t and a max displacement of 4000t and most of their other ships had a good 20-25% more displacement than the Tribals or Fletcher-class which themselves had a good 20-25% size margin. The Kriegsmarine destroyers split the difference between the French and the Anglos, but the Type 1936A/Z23 class deserves special mention for mounting 15cm (5.9 inch) guns - what would have been considered light cruiser weapons, albeit in smaller number.
Arguably, the key distinction between destroyers and light cruisers in the Washington Naval Treaty era to the start of the guided missile age is armour - even the lightest cruisers had some degree of armour protection.
Meanwhile, for the Royal Navy, the return of the corvette and frigate distinctions were meant for ships built to commercial standards - the frigate being otherwise similar to the RN definition of a 'Sloop' like the Black Swan - a slow, destroyer-sized twin-shaft escort for protecting shipping.