the 1907 9 October Hague convention basically says food fuel and coal and transit is ok, weapons ammo supply and basing is not, The 1899 convention is silent.
But both have a court of arbitration for matters in the pacific.
One of the reason why UK US wars after 1815 are really in the ASB section is that not only do the US and UK have a similar mechanism between themselves but they consistently use it and abide by decisions of the arbitrator.
Prior to that convention the UK would probably look on the merits of the case. So if the war began with a Japanese attack or act of aggression, the UK would probably veer towards more leniency in allowing a US fleet to base out of UK waters. If its just a dispute got out of hand more towards neutrality.
On the other hand with a a dispute getting out of hand neutrality could well end up with the USN actually being in the Philippines before the shooting starts.
A lot of the UK attitude would be on the merits of the case they are not obliged to support either side. The attitude to the Russinas is coloured by ) dont like Russia, b) shooting at fishing fleets means only the most grudging sort of neutrality is to be expected, and c) the point of the Japanese alliance to keep the Russians out of the Pacific. Its no guide to how the UK will behave to a US navy, unless it starts seeing IJN torpedo Boats everywhere.
Kaigun I think gives some view of the IJN war plans this early but frankly they are broke.
But both have a court of arbitration for matters in the pacific.
One of the reason why UK US wars after 1815 are really in the ASB section is that not only do the US and UK have a similar mechanism between themselves but they consistently use it and abide by decisions of the arbitrator.
Prior to that convention the UK would probably look on the merits of the case. So if the war began with a Japanese attack or act of aggression, the UK would probably veer towards more leniency in allowing a US fleet to base out of UK waters. If its just a dispute got out of hand more towards neutrality.
On the other hand with a a dispute getting out of hand neutrality could well end up with the USN actually being in the Philippines before the shooting starts.
A lot of the UK attitude would be on the merits of the case they are not obliged to support either side. The attitude to the Russinas is coloured by ) dont like Russia, b) shooting at fishing fleets means only the most grudging sort of neutrality is to be expected, and c) the point of the Japanese alliance to keep the Russians out of the Pacific. Its no guide to how the UK will behave to a US navy, unless it starts seeing IJN torpedo Boats everywhere.
Kaigun I think gives some view of the IJN war plans this early but frankly they are broke.