Final answer:
From 478 to 465 BC, Sparta did not interfere with Athens, focusing on domestic issues instead. Discussion of war with Athens arose in 475 BC, but a major earthquake in 465 BC led to destruction in Sparta and a helot uprising, preventing Spartan aid to Thasos.
Step-by-step explanation:
During the period from circa 478 to 465 BC, Sparta was primarily focused on domestic issues and did not attempt to interfere in Athen's internal affairs. However, discussions regarding war with Athens were recorded in 475 BC by Diodorus. Nonetheless, the potential Spartan interference re-emerged in 465 BC during the Revolt of Thasos when Sparta offered aid to the Thasians. A significant earthquake struck Sparta, which led to considerable destruction within the city and prevented the Spartans from providing the sought aid. This natural disaster also incited a helot uprising, which Sparta had to deal with internally, further hindering their external military efforts.