Depends on your definition of "allow." They don't have much of a say in the matter. All they can do is restrict what they provide even more than they already have, in protest. Besides having a secondary source in times on need, maybe that's why Egypt is buying more Russian equipment and trying to acquire ToT with certain production lines, so the west can ease some of the restrictions and perform long overdue upgrades. The F-16s can use better air to air missiles, the Abrams can use the M1A2 upgrade in armor, ATGMs & electronics and the Apaches need the Long Bow radar.
As of now, the MiGs might have better offensive bite than the F-16s and the Ka-52 should be more potent and have better linkage with one another than the Apaches. I don't think the T-90 at its best would outperform the Abram, though.
The T-90 won't outperform the Abram..but: here are some plus ++
T-90 armour is 800-830mm against kinetic energy and 1150-1350mm against chemical energy. The reason for this increase, despite the weight difference, is the Kontakt-5 heavy-duty interactive armor, which reduces the ability of penetrating guided missiles, tandem shells and sabo shells to greatly facilitate the work of the original armor of the tank and in some cases may be able to stop The shell itself..
For the T-90S, it uses a 125-mm smooth 2A46M-5 gun and has a large range of shells that can be used. The tank has a Svinets-2 shell with a tungsten head and a penetration capability of 660-740mm from a distance of 2 km with an effective duration of 3-4km. The 9M119 Refleks, which are capable of penetrating 900 mm from a distance of 5 km, are capable not only of hitting tanks but also of hitting low flying helicopters.
The T-90 also have a clear superior point: a laser-guided warning system, So when other tanks direct their laser range finders towards the T-90, as well as the laser guided missiles.. When this happens, the crew is warned and with a push of a button the tower is directed towards the source of danger. This is very important not only because it alerts the crew of the tank about the danger, but because when the tower is turned, the source of danger will face the front of the tower which is the most shielded area in the tank, this is one of the reasons for the success of the T-90 tank in Syria and the inability of armed groups to destroy them..
For Abrams they do not have any warning system!
It is worth noting that the active defense systems Arena or Shtora can be added according to the customer's request for T-90 which greatly increases its survival against the various sources of hazards and provides an additional protection factor not found in the Abrams..
