Question: Who canceled the project for the Landkreuzer P. 1000 Ratte, which would have surpassed the Panzer VIII Maus as being the heaviest fully enclosed armoured fighting vehicle ever built?

Context articles: Panzer VII Löwe
Marder (IFV)
Panzer VIII Maus
Kampfwagenkanone
Infantry fighting vehicle
Landkreuzer P. 1000 Ratte
Kubinka Tank Museum
BA-64
Panzer
Al-Fahd

The Panzerkampfwagen VII Löwe (Lion) was a design for a super-heavy tank created by Krupp for the German government during World War II.
 The project, initially code-named VK 70.01 (K), never left the drawing board, and was dropped in 5–6 March 1942, in favor of Porsche's heavier Panzer VIII Maus.
The Marder (German for "marten") is a German infantry fighting vehicle operated by the German Army as the main weapon of the Panzergrenadiere (mechanized infantry) from the 1970s through to the present day.
 Developed as part of the rebuilding of Germany's armoured fighting vehicle industry, the Marder has proven to be a successful and solid infantry fighting vehicle design.
 While it does include a few unique features, such as the fully remote machine gun on the rear deck, it is overall a simple and conventional machine with rear exit hatch and side gun ports for mounted infantry to fire through.
 The Marder is currently being replaced by its successor, the Puma.
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944.
 It is the heaviest fully enclosed armoured fighting vehicle ever built.
 Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by the advancing Soviet forces.
Kampfwagenkanone (short: KwK / literal translation de ⇒ en: "fighting vehicle cannon") was the designation to any type of tank gun mounted in an armoured fighting vehicle or infantry fighting vehicle of the Nazi-Wehrmacht until 1945.
 The wording was derived from the German nouns "Kampfwagen" (fighting vehicle) and "Kanone" (cannon or gun).
 However, the present-day designation in German speaking armed forces to this particular weapon system is Panzerkanone (en: tank gun).
An infantry fighting vehicle (IFV), or infantry combat vehicle (ICV), is a type of armoured fighting vehicle used to carry infantry into battle and provide direct fire support.
 According to the Treaty on Conventional Armed Forces in Europe, an infantry fighting vehicle is "an armoured combat vehicle which is designed and equipped primarily to transport a combat infantry squad, and which is armed with an integral or organic cannon of at least 20 millimeters calibre and sometimes an antitank missile launcher".
 They often serve as both the principal weapons system and mode of transport for a mechanized infantry unit.
The "Landkreuzer" P. 1000 "Ratte" (English: "Land Cruiser P. 1000 "Rat"") was a design for a super-heavy tank for use by Nazi Germany during World War II, proposed by Krupp director Edward Grotte in June 1942, who had already named it ""Landkreuzer"".
 Submitted designs and drawings of the tank went under the names "OKH Auftrag Nr.
 30404" and "E-30404/1", which were presented in December 1942.
 The tank was planned to be 1000 metric tonnes, being far heavier than the Panzer VIII "Maus", the heaviest tank ever built (weighing 188 tonnes).
 The project gained the approval of Adolf Hitler, who had expressed interest in the development of the tank, but was canceled by Minister of Armaments Albert Speer in early 1943.
The Kubinka Tank Museum is a large military museum in Kubinka, Odintsovsky District, Moscow Oblast, Russia where tanks, armoured fighting vehicles (AFVs) and their relevant information are displayed and showcased.
 The museum consists of open-air and indoor permanent exhibitions of many famous tanks and armored vehicles from throughout the 20th and 21st centuries (between 1917 to the present day).
 It is also known to house and display many unique and one-of-a-kind military vehicles, such as the Nazi German Panzer VIII Maus super-heavy tank, the Troyanov heavy tank and a Karl-Gerät heavy self-propelled artillery, amongst other single or limited-production prototypes from the Soviet Union and Nazi Germany.
The BA-64 ("БА-64", from "Bronirovaniy Avtomobil", literally "armoured car") was a Soviet four-wheeled armoured scout car.
 Built on the chassis of a GAZ-64 or GAZ-67 jeep, it incorporated a hull loosely modeled after that of the SdKfz 221.
 The BA-64 was developed between July and November 1941 to replace the BA-20 then in service with armoured car units of the Red Army.
 Cheap and exceptionally reliable, it would later become the most common Soviet wheeled armoured fighting vehicle to enter service during World War II, with over 9,000 being manufactured before production ended.
Panzer (] ) is a German word that means armour.
 It is also used by German-speakers as an abbreviation meaning ""armoured fighting vehicle"" or tank (the military vehicle).
 The full German word for "armoured combat vehicle" is "Panzerkampfwagen".
 The word "Panzer" is occasionally used in English and some other languages as a loanword in the context of the German military.
The Al-Fahd is an armoured fighting vehicle used by the Armed Forces of Saudi Arabia.
 It was the first armoured fighting vehicle developed and built in Saudi Arabia.
 The vehicle is produced by the Abdallah Al Faris Company for Heavy Industries, which is based in Dammam.