I would say within EEZ-Shallow waters
for patrol operations.
I am not sure how frequently the platform is being used but from what i know it has active time more than half a year.
Wonder what happened to 2+2 agreement, it makes sense for at least 2 ships to be built in here so their personnel can be trained.
Best bet, turkish subcontractors will be working in Ukraine in construction,they don't have sufficient number of naval architects and field engineers to handle the project.
Ukraine engines were considered earlier for Ada class to make an optional offer to other countries, wonder who didn't want to cooperate then.
And probably STM will handle whole integration process of the gas turbine this will introduce a valuable know-how, but then it will have to be a CODOG and i am not sure if a single ukranian gasturbine outperform the earlier CODAG. They will have to switch to 2+2 configuration which will require major modifications.
I doubt if the engines get larger it will compromise the fuel capacity thus the range.
Different Zorya engine have to be used for Ada-class but some info
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The first to use GT-25000 gas turbines is the 052C destroyer, which uses 2 GT-25000 gas turbines + 2 MTU diesel engines for diesel-fuel alternate power (diesel engines for low-speed navigation and gas turbines for high-speed navigation), making 052C/D The maximum speed of the type destroyer can reach 30 knots, if it is diesel-fuel combined power, it is estimated that the speed can reach 32 knots!
来源:
https://atgibxezqfwpnxb4liakifeddq--twgreatdaily-com.translate.goog/zh-cn/IS09wm4BMH2_cNUgtpTZ.html
Since China and Ukraine signed the "UGT-25000 Gas Turbine Production License and Single Engine Sales Contract", Ukraine sold 10 UGT-25000/DA80 gas turbines to China and transferred related technologies. China made localization of the main naval surface ships. Embarked on the road of alternate diesel-fueled power supply.
Since the air flow, volume, and weight of UGT-25000/DA-80 gas turbines are greater than those of LM-2500, they cannot be directly used in the hull of the Type 052 destroyer. The military industry has developed the 052 modified destroyer with its power system. They are the 052B destroyers 168 and 169 with a full load displacement of 5850 tons, and the 052C destroyers 170 and 171 with a displacement of 6000 tons.
When introducing UGT-25000/DA-80 gas turbines from Ukraine, the Navy already has advanced experience in using American-made LM2500 gas turbines.
Based on the Navy’s experience, military industry has made a series of improvements to UGT-25000. The cover adopts LM2500 box type. The gas turbine is completely covered, the noise and temperature of the engine room are reduced, and the working environment of the engine body is improved.
In addition, an observation window is installed on the box to facilitate the staff to observe the status of the gas turbine; lighting and other systems are installed to facilitate the staff to troubleshoot the system; the exhaust pipe and the gas turbine are installed on the same base, which fundamentally solves the problem of easy aging of tracheal rubber.
UGT-25000 itself is a civilian product. The first three models are DG80, DN80, and DU80. DA-80 is a civilian-to-military product.
Ukraine has increased the thermal efficiency to about 36%. This indicator has been compared with the LM2500 of General Electric Company in the same period. The gas turbine is flat, but the weight is multiple of LM2500.
In contrast, UGT-25000/DA-80 has a power output of 28,000 kilowatts, which is even 44.9% higher than the 19,800 kilowatts of LM2500. For gas turbines, which are already very light power machinery, they can guarantee thermal efficiency. Under the circumstances, a few tons of weight gain does not matter.
For the Chinese Navy, due to the hindrance of the import of LM2500 gas turbines and the inability to reverse imitation due to reasons such as intellectual property rights, UGT25000/DA-80 has become the best choice. Although it is not advanced, it is at least usable and gives the Navy The newest 055-type 10,000-ton large drive, which has a high speed of more than 30 knots, can provide the best solution to the problem of insufficient power that has dragged down the tonnage and aspect ratio of ships for many years.
Addition
I couldn't find it but there was a blog claiming UGT25000 under performed in hot tropical climate (South China Sea) so engine had to go through improvements.
Also Ukrainians did not know how to integrate the engines to modern navy ships.