Misc: what is the element for the symbol La?

Questions

In 1983 Korean Boeing 747 strays into ---------- and is shot down by a Soviet jet. ?

In 1983 Korean Boeing 747 strays into Siberia and is shot down by a ---------- jet. ?

In 490 BC ---------- runs first marathon, to announce the victory of Sparta over Persia. ?

In 490 BC Phidippides runs first marathon, to announce the victory of ---------- over Persia. ?

In 490 BC Phidippides runs first marathon, to announce the victory of Sparta over---------- . ?