Not a difficult job when they have to down Su-27, MiG-29, MiG-23, etc (AKA the very things they were designed to down).
Unless Russia can pump out 300 Su-57 overnight they would be at a huge numbers disadvantage in the air.
This is where a good number of things like the Type 45s would be useful - especially if they stay on top of upgrades to the Aster platform, etc. so as to give themselves protection against progressive development of Russian anti-ship missiles.