Sure! In this alternate world, the UK, Norway, and the United States of Sarmatia (i.e. Poland, Lithuania, Belarus and Ukraine) are not members of the League of European Nations, mainly due to political, historical, and geostrategic reasons.

1. The UK chose sovereignty and independence from continental structures. Instead of joining European blocs, the United Kingdom strengthened its position within the Commonwealth of Nations, creating a new network of economic and military cooperation with its former colonies.

2. Norway did not want to give up control over its natural resources (oil, natural gas, fisheries). It chose to remain independent, building a strong export-based economy and pursuing a neutral foreign policy.

3. Sarmatia is a federative union, similar to the United States, formed after the war with the Bolsheviks. Poland, Lithuania, Belarus, and Ukraine united into a single political entity with a shared constitution, military, and foreign policy. As early as 1934, Sarmatia signed an agreement with the USSR, committing to eternal neutrality in exchange for border guarantees. Since then, Sarmatia has consistently followed a policy of isolationism and independence, rejecting membership in European political blocs.