My Dad graduated from the Naval College in 1945. Their study program was abruptly changed just months before graduation and cadets were sent to train as marines and to practice landings on the beaches of the Caspian Sea. They learned to drive lend leased Jeeps, fired machine guns etc. Then they were back to their studies and exams. It has never been explained.
In 1945 the US trans continental rail links could not handle the volume of material required for operations Olympic/Coronet, meaning ships were loaded on the US east coast and sent through the Panama Canal. The trans Siberia link had much less capacity. The USSR therefore expected to make full use of Lend Lease materials shipped direct to the far east as it mounted a series of amphibious operations to take the islands north of the Japanese main islands before any attacks further south.
In 2010-2012, several Genshtab documents with maps were discovered in central archives. Military games of 1940-1941 and invasion plans. Mark Solonin has covered this subject extensively in his last books and articles.
What country war games or plans on an assumption an enemy army will penetrate deeply into the country?
Just let me state the facts: after years of ridiculing Suvorov's theory, a number of his critics in the Russian historical community after they got access to archives in the late 1990s-2000s have (silently) agreed that the USSR did plan to strike first. And discussion moved on - to the possible dates, areas of operations, etc.
Mikhail Meltukhov was one of the most reputable names on that list.
If they are silent how does anyone know they changed their minds? Strike first in 1941 or 1942 or later? That the USSR had plans for an attack on Nazi Germany is unremarkable, that they did not intend to do so in mid 1941 is shown by dispositions and supplies. I note from the Wiki article Meltyukhov decides the USSR was always being provoked by Poland, nothing the other way, and the Red Army was on a peacekeeping mission in Poland, this is consistent with believing the Red Army was better than it was in 1941, not short of all sorts of equipment, supplies, trained troops and competent commanders, caught by surprise, but unlucky enough to be hit when the ready to go ready to win offensive dispositions were at their most vulnerable to counter attacks. Bad luck, accident of timing, could happen to anyone.
The French military would be a lot better in 1941, including better trained reserve troops manning the expected quiet sector along the Meuse, their forces being largely on the borders, like Red Army in 1941, were obviously heading for Germany as soon as the shooting started. Bad luck, accident of timing, could happen to anyone.
To repeat OKH and OKW did not detect signs of a Red Army offensive in mid 1941, the build up of the supplies required to launch an attack with millions of troops is very hard to hide. There were plenty of Red Army troops on the borders, mostly in the south, digging in, consistent with the idea, like most countries, including Poland and France, of stopping the enemy from entering the country, think WWI rates of advance against opposition. In Stalin's USSR creating defensive plans could be considered defeatist, rather like what happened to the Heer commanders later in the war, worthy of punishment, best to assume the army would indeed stop the enemy at the borders, followed by the victorious offensive.
The areas Stalin took in 1939/1940 were done after Germany signed a treaty that largely allowed Stalin to take those areas.
20 August 1939, Red Army counter attack on Japanese forces in Mongolia begins.
31 August, Japanese forces on the USSR's idea of Mongolian territory have been destroyed.
1 September 1939, Germany attacks Poland
16 September USSR Japan cease fire in Mongolia comes into effect
17 September, Red Army enters Poland
19 September, Red and German armies meet at Brest-Litovsk
29 September, revision of Nazi-Soviet pact, Lithuania to USSR, demarcation line in Poland moved east to the Narew-Bug-San rivers. USSR Estonia "mutual assistance" pact signed.
5 October USSR Latvia "mutual assistance" pact signed.
10 October USSR Lithuania "mutual assistance" pact signed, parts of pre war Poland, including Vilna (annexed by Poland in 1922), are moved to Lithuania.
12 October the USSR Finland negotiations start. The USSR wants a territory swap, but has little interest in real negotiations.
30 November the USSR invades Finland.
12 March 1940 the USSR Finland treaty is signed.
10 May German attack in the west.
9 June USSR Japan border agreement.
14 and 15 June USSR ultimatums to Baltic states followed by occupation.
22 June French Armistice is signed.
25 June French Armistice comes into effect.
26 June USSR ultimatum to Romania, Hitler urges acceptance.
28 June USSR occupies Bessarabia and Northern Bukovina. Bessarabia was covered in the Nazi-Soviet agreement, Bukovina was not, and that upset Hitler who felt he had no choice and then became officially worried about the Romanian oil fields. This is despite it was losing Bessarabia that put Ploesti at greater risk, basically halving the distance between it and the Soviet border, yet Meltyukhov believes it is only then Hitler figured out the threat. Later in 1941 the Soviets protested but otherwise did nothing as large numbers of German troops were sent to Romania. Hitler's ideas for lebensraum in the east and the destruction of the USSR date to the 1920's.
German divisions were transferred east after the fall of France due mostly to army suspicion about the USSR
13 July OKH gets word of Hitler's idea Britain is hoping for USSR intervention, and moves to flesh out plans to invade the USSR.
21 July Hitler announces his intention to attack the USSR to Wehrmacht commanders.
31 July Hitler noted a decisive defeat of Britain was required but that might be done by eliminating the USSR.
The Baltic countries are formally annexed to the USSR in July and August 1940.
27 September Tripartite Pact signed.
23 October Hitler meets Franco
24 October Hitler meets Petain.
28 October Hitler meets Mussolini. Italy attacks Greece, Britain now has friendly airfields in theoretical range of Ploesti.
12 November Molotov arrives in Berlin, talks do not go well.
20 November Hungary joins the tripartite pact
23 November Romania joins the tripartite pact
5 December invasion plan put to Hitler who disagrees Moscow should be the main objective, despite it being a unanimous conclusion of the OKH and the independent studies of staff from three army groups
21 December Hitler directive 21, Barbarossa plan
17 March 1941, Hitler alters the plans so Army Group South will only do one thrust, not two, as clearing the Baltic coast was a major objective, but also the Norwegian garrison should be reinforced, diluting strength in Finland.
In mid 1941 the Red Army allocated large numbers of vehicles away from combat units to construction ones to enable the digging of fortifications. In the final weeks before Barbarossa forward Red Army commanders could tell what was happening on the other side of the border and repeatedly requested to be allowed to move to better defensive positions.
Early April 1941 Red Army frontier troops are becoming aware of the German troops on the borders.
6 April Germany invades Yugoslavia
13 April USSR Japanese neutrality pact.
28 April allied troops leave Greece.
15 May Zhukov is worried enough he proposes a pre emptive strike, given the weather meant the mud season had not ended in the north and the rivers were running high, how far an attack by either side would have gone is a good question.
Apparently the Red Army was so much better than the Heer, no detection of all the supplies moving, despite the Germans having air reconnaissance and the Red Army none, no detection by German troops on the border of preparations for an attack, with Red Army mechanised units apparently able to complete quick route marches from deeper in the USSR arriving in fighting order ready to enter combat without being detected by the Luftwaffe. Also as of 12 June the German army in the east is supposed to be disorganised enough there was a good chance a Red Army attack would have succeeded, despite the Barbarossa planning deadline of mid May and the well known delays due to late rains, but the troops sent to the Balkans largely came from Army Group South and operations out of Romania did not start for about another week. Where was the invasion of Romania on 23 June?
Barbarossa competes for the title the biggest mistake Hitler made, as a result since probably the 1940's the haters of communism, the admirers of German forces and the followers of the wrong side lost WWII in Europe crowd began circulating ideas that Stalin was coming in 1941, so not a Hitler mistake but a good move, now we have people trying to paint the Red Army as so ready for a major offensive it fell to pieces in the north when attacked and was unable to carry out offensive operations in the south, including on the undisturbed Romanian front.
In 1944 the Germans had been accustomed to attacks by the Ukraine fronts and kept careful watch on key offensive armies, meantime in the north the Red Army added a few more units, less than those in the south, but brought all units up to (rare) full strength, on the strategic map counting units it was obvious the Red Army was going to attack in the south, on the ground the northern forces were now 2 or 3 or more times more powerful than earlier in the year. Operation Bagration, the destruction of Army Group Centre followed. Bad luck, accident of timing, could happen to anyone. Given the 1941 ideas that lots of troops near the front without relevant transport and supplies equals preparing for offensive action, Army Group Centre was clearly ready to launch attacks towards Moscow.
Try Stalin knew the Germans were desperate to avoid a two front war, were in great need of the supplies the USSR was sending and wanted more, needed 1941 to finish off the British, summer in particular to attack Britain directly, the Red Army was not ready, since Stalin did not want a 1941 war so did Hitler but Britain at least did want the two to fight, letting the Luftwaffe see the Red Army dispositions was a good way to minimise accidents, strangely enough the people around Stalin agreed, at least in public, and the repressive system Stalin commanded made sure people followed Stalin's wishes.
One of the Red Air Force problems in 1941 was the need for better airfields for the next generation of aircraft, concrete runways for example, limiting their deployments. Also the reported 1941 offensive has the Red Air Force smothering the Luftwaffe bases to a depth of hundreds of km, like the allies did later in the west, not like the Red Air Force in 1941-45 of largely ignoring the enemy air force bases.