Tarentul missile ship is getting a new fire control system of the RFS 962 Shuya, Sevastopol, December 2020.
Does that mean new missiles will be installed ? or just for trial ?
AFAIK the four Moskit or SS-N-22 Sunburn missiles are going to be replaced with 16 Uran missiles, and a Pantsir-M system is going to be fitted too to replace any AK-630 system.
The new fire control system and phased array radars will replace the search radars of the Pantsir-M in the detection and search role.
2- How against america ?
The Soviet and Russian navy even at their height were never about facing the west let alone just the US on its own and it was only ever intended for survival and trying to keep US carriers away from Russian or Soviet shores.
With Kinzhal and MiG-31s as well as corvettes and frigates and land based anti ship missiles and weapons they have pretty much achieved the ability to be safe from US conventional naval threats.
Their frigate programme is not going to effect their global reach really... they have sailed corvettes and frigates around the world in testing, but both ship types lack the endurance for global use and will replace cold war corvettes and destroyers in terms of coastal and near coastal Russian use. Note they are designating their upgraded cold war destroyers as frigates too even though their size means more endurance and more space is available.
They will start looking to expand to global reach when they start making new destroyers and new cruisers even though upgraded cruisers and their existing carriers will allow international visits to allies and friends.
That means they wont be a global force for probably 8-10 years at least though with the laying down of two helicopter carriers they will be laying destroyers down pretty soon in my opinion because they will need them to support their operations... but they wont be fully operational for 8-10 years as I say.
They don't have the interest or the funding to dominate and police the worlds oceans like the US, and they wont be making anywhere near the 10 carriers and carrier groups that would be needed to have a global permanent presence.
They will likely keep the Kuznetsov and perhaps make two CVNs in the 70-80K ton weight range, for visiting other continents with a surface group of ships that can effectively protect themselves and survive practically any attack.
The CVNs will likely have S-500 and be pretty formidable, while the Cruisers they build will likely be amazing in terms of weapons and sensors, but they will primarily be used to build up international trade with countries that traditionally don't currently trade with Russia.
Without carrier groups and ships that can sail to the ends of the earth the west will simply be able to blockade them like they did with Japan just before WWII started.
The ships are for access to world trade, not to invade and bully third world countries...