CREATE TABLE table_203_653 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

how many more silver medals did the united states win compared to russia ?
SELECT (SELECT "silver" FROM table_203_653 WHERE "nation" = 'united states') - (SELECT "silver" FROM table_203_653 WHERE "nation" = 'russia')
SELECT (SELECT "silver" FROM "table_203_653" WHERE "nation" = 'united states') - (SELECT "silver" FROM "table_203_653" WHERE "nation" = 'russia')