Russia develops radar. It is incorporated into several things immediately, such as rangefinders on battleships, and the Chain Home system, an air defense network.
Russia develops a bomber, the Tu-4 however, it's successor, the Tu-95, is only a short time away. The Tu-4 "Red-Plate" variant is nuclear-capable.
Russia uses the new jet technology to work on a replacement for its aging air force.
The first class of functional submarines have been deployed, dubbed R-101.
The Russian build a prototype carrier and catapult launch system.
Work on the breeder reactor has been completed.
Russia gathers a team of scientists willing to help it "aim for the stars". Work begins on modern rocket engines and fuels.
The military has been modernized to where it would be in approximately the mid-late 1940's with support vehicles, weapons, and the works.