How credible is a TU-95, B-52, SU-30, and an F-16 flying in formation?

The aircraft carrier has clearly been placed on an aircraft carrier carrier

If memory serves me right, India uses Su-30, so this checks that box. Alternatively, Belarus might pitch in, after Lukashenko is overthrown. Algeria, Armenia and Vietnam have them as well.

With Tu-95... This requires some mental gymnastics. Obviously, Ukraine had them in the 90s, so the scene could take place then, but I don't think this feels canon. However. In russia, there exists a region called Kuban, with significant proportion of ethnic ukrainians and history of separatism. Ukraine actually could have very legitimate claims on the region if this was still how it worked in 21st century. So, if we suppose a sort of greater Kuban, a Hippanis republic, reaching out to Engels air base, they could have Tu-95s after independence from Russia. Or I mean, a lot of post-russian states might have Tu-95s, but this is a boring answer, Ukraine landing on Taman peninsula to help establish Greater Kuban is the good ending.