Russia holds onto Port Arthur in the Russo-Japanese war

Anyway Japan could fail to capture Port Arthur during the Russo-Japanese war

What would be the impact on the Russo-Japanese war

Would Japan be allowed annex all of Sakhalin

What would be the impact on spheres of influence
 
Russians can only hold onto Port Arthur if they win. Even if the defenders manage to throw back assaults on the hills, the Japanese will continue the war until defenders run out of supplies and surrender, so they can have favorable peace settlement.
 
Holding on Port Arthur with naval artillery support, keeping Makarov alive and winning at Mukden would surely help. Japan may go bankrupt and still keep fighting, resulting in a stalemate and war ending with Korea remaining Japanese and Manchuria Chinese and if the fleet in Port Arthur is still available even as a fleet in being it may alter the result of Tsushima, the flagship Mikasa was hit several times in OTL( the Japs had extremely good luck in naval battles, the enemy admiral dying in the opening shots first the Chinese admiral abord the Dingyuan at the battle of Yalu River the Russian admiral at the battle of Yellow Sea and again in Tsushima ). Without Tsushima there would never be such a humiliation for Russia although the Russian Navy would continue to practice their outdated tactics.
 

Aphrodite

Banned
If the Russians can hold out at Port Arthur for another 5 months, the Baltic Fleet would not have to run the gauntlet through the Straits of Tsushima. Instead, it would have easily sailed into Port Arthur. The combined fleet would have given Russia complete naval control. Japan's war effort would collapse. Only 3rd party intervention would save them. Salisbury would do it only if the Americans joined. Teddy may have wished to but Congress is unlikely to allow it.

Recommended POD: Between 1898-1904 about 20,000,000 rubles were diverted from the fortification of Port Arthur to the development of Dalney as a commercial port. The Japanese quickly capture Dalney, 60 miles from Port Arthur. Without Dalney, Japan's resupply effort would have been difficult. The movement of the 10 innch guns used to reduce Port Arthur would have been impossible
 
Holding on Port Arthur with naval artillery support, keeping Makarov alive and winning at Mukden would surely help. Japan may go bankrupt and still keep fighting, resulting in a stalemate and war ending with Korea remaining Japanese and Manchuria Chinese and if the fleet in Port Arthur is still available even as a fleet in being it may alter the result of Tsushima, the flagship Mikasa was hit several times in OTL( the Japs had extremely good luck in naval battles, the enemy admiral dying in the opening shots first the Chinese admiral abord the Dingyuan at the battle of Yalu River the Russian admiral at the battle of Yellow Sea and again in Tsushima ). Without Tsushima there would never be such a humiliation for Russia although the Russian Navy would continue to practice their outdated tactics.
Japan can't keep fighting after it goes bankrupt.
 
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