Why are the anti-submarine torpedoes of Russian warships completely different from those of Europe and America? 533 mm, and anti-ship?

Torpedoes are mostly the same size, light 324, heavy 533 and Russian super heavy 650. Western warships often carry Sanlian 324 because of the advantages of torpedo technology and performance, that is, light torpedoes can still reach the expected range and speed. Shipborne anti-submarine torpedoes in the United States and Europe are only the last resort. The main force is aviation anti-submarine (American aircraft carrier group, European nuclear submarines and submarines are very strong), and the range of Sanlian 324 is often around 10 to 20km. At this time, anti-ship is basically meaningless and the distance is too close. Russia often uses 533, because on the one hand, the performance of Russian torpedoes is insufficient, and on the other hand, the anti-submarine capability of Russian aviation is insufficient, which needs to be supplemented by shipborne anti-submarine torpedoes. Most 533 heavy torpedoes are anti-submarine and anti-ship, but Russian submarines have to undertake anti-ship capability (wake homing capability) because Russian surface ships have insufficient anti-ship capability (no aircraft carrier), and the Soviet Union has always used submarines as the main attack force. The main target of American and European submarines is Soviet submarines, and their anti-ship actions depend on the formation of aircraft carriers, so they emphasize the attack on submarines, so they generally don't talk about anti-ship, but that doesn't mean they can't. You can find videos of torpedo anti-ship and mk48 attacking water targets.