I swear to defeat the enemy.
Glory to the Red Army!
Southern Front
The surrender of Hungary, and their siding with the Comintern, let the advancing Sovjet troops use the Hungarian rail road system. The Germans, angered by the surrender of Hungary annexed it, and a Hungarian civil war broke out. The local people in power were usually pro-nazi, and most of the country was handed over to German control. The people of Hungary, including the rail road workers thought very differently. All train carrying Sovjet forces were allowed to use the rail roads, all the way to their de debarkation points.
Other Russian tank forces moved from Budapest towards Bratislava, hoping to force Slovakia out of the war. In the meanwhile, to the North light armoured units where moving from the Russian boarder towards Bratislava.
Yugoslav Front
With the surrender of Hungary, and the invasion of Yugoslavia from the south by Greece and Italy the first Yugoslav Front Army moved south to first check the Italian advance, and then push it back. It was helped by the Yugoslav Army which was almost finished mobilising.
A interesting note was that -for the moment- the Yugoslavia was receiving large amounts of aid from Russia in the form of fuel, metal, foodstuffs, and cash.
Baltic Front
Baltic front underperformed compared to Southern, and especially Western Front. It did manage to destroy the northern end Koningsberg pocket pocket laying siege to the city. But it was plagued by supply problems, and it was only with help from Western front that it managed to close the pocket.
Western Front
The most spectacular advances were made by Western Front. Its light armoured division raced forward in a extreme form of deep battle, first surrounding and capturing Warsaw before moving off to Danzig and Lodz. In fact, the advance was going so fast that the following infantry was having difficulty following up the advance, and on more than one occasion Russian tank units had to fight their way west while defending themselves to the East.
After a few more days or weeks of advance, German resistance -which until now had been pathetic- would increase, and by that time it would be disastrous if the light armoured divisions were caught alone. So STAVKA started looking for a good place where the infantry could catch up, and the tanks could re-supply before the final push on Berlin.