Space race participant Soviet Union. Sixteen constituent republics. Sputnik's birthplace. See 51 Across. Security Council member. Sputnik land. Some upsetting taboo slang to boot Shostakovich's land. Sputnik's bpl. Security Council mem. Superpower's initials Sputnik's birthplace Stalin ruled it SALT participant Section of final song, and original source, too Space race participant Special sourdough sandwiches too Stalin's land Stalin's realm Stalin's domain Subj. of a 1991 breakup SALT signatory SALT I signer Soyuz launcher Stalingrad's land, for short See 4-Down SALT party Stalin's land, in brief Space race competitor, for short State led by Lenin, in brief Stalin's empire Stalin's land Superpower until 1991 Subject of a whimsical "White Album" tune Stalin's empire Soyuz 1 launcher Space race participant Stalin's domain Sputnik's birthplace SALT party 1984 summer Olympics no-show Sputnik launcher Superpower until 1991 SALT participant SALT signer SALT talks participant 1984 Summer Olympics boycotter Superpower that dissolved in the 1990s 1984 Summer Games boycotter SALT I signer Software purchaser Second country to develop the atom bomb Superpower no more "___ Sprach Zarathustra," 1973 song Superpower of old "___ sprach Zarathustra" Stalin's gov. Start of an aside Stalin's empire, briefly SALT I signer SALT signer See 1-Across 1984 Summer Games boycotter SALT participant "___ Sprach Zarathustra" START I treaty party Shout for attention Soyuz 1 launcher Sputnik launcher (Abbr.) 1984 summer Olympics no-show Space-race participant Sputnik's birthplace, for short SALT party Sputnik launcher, briefly Superpower until '91 "Sounds reasonable to me!" SALT talks participant "Same here" Seconder's opinion "See" follower in a footnote "Sounds good" SALT signatory Space race competitor, for short "Sounds good to me" "Same here" State led by Lenin, in brief "Same here" SALT talks participant "So true" SALT signatory "Same with me" Superpower no more Second country to develop the atom bomb Superpower of old 'Same with me' SALT party Strauss: "___ sprach Zarathustra" ''Sounds good'' Seconder's opinion "Same here!" *Social studies class that lacks an honor code? Seamus Heaney, e.g. Sonneteer Slam participant Sonneteer Starter with "ran" She's not averse to a verse Sonnet writer Sonneteer ___ Sprach Zarathustra Spender, for one Sonnet creator Sonnet writer Slam competitor Snug-bug connector? Sonneteer, e.g. Sonneteer. Spenser or Spender. Sandburg. See 35 Across. Stanley Kunitz, for example. See 51 Down. Sandburg Sonnet source See 18 Across Spenser or Spender Sandburg was one Sassoon or Service See 7 Down Southey was one Sexton or Nemerov Spender, for one Shakespeare, e.g. Sexton or Pope, e.g. Shelley, for one Sonneteer Sexton, say Sappho, e.g. Sonneteer, e.g. Shelley, e.g. Sexton or Sarton Slam participant Slam artist Sonneteer Shakespeare or Pound Service for one Sonneteer Sarton or Burns Sexton or Burns, e.g. Sonneteer, e.g. Sappho, e.g. Spender, e.g. Shakespeare was one Slam participant Sexton, e.g Slam participant Slam participant Slam artist Sonneteer Shakespeare or Pound Sonneteer, e.g Sonnet writer Shelley's ''nightingale'' Sonneteer or psalmist Sappho, e.g Sonnet creator Sappho or Pindar Sappho or Pindar Smiling, evidently Smiling, for now Smiling, for now Smiling, perhaps Smiling, maybe Smiling, maybe Smiling, perhaps Subcontinental wrap Silk wrap Silk or cotton wrap Sad-sounding attire South Asian garment Sri Lankan garment South Asian garment Subcontinental wrap See 36 Down. Silk wrap Silk dress Southern Asian apparel "Slumdog Millionaire" garb "Slumdog Millionaire" costume part Silk dress, maybe South Asian wrap Silken wrapper South Asian garment Silk body wrap Some get wrapped up in it "Slumdog Millionaire" costume "Slumdog Millionaire" dress "Slumdog Millionaire" garb Sri Lankan garment Souvenir from Agra Subcontinental garb South Asian garment 'Slumdog Millionaire' costume part Silk dress, maybe South Asian garment Souvenir from Agra Subcontinental garb 'Slumdog Millionaire' garb Symbol of Bangladeshi culture Subcontinental wrap Symbol of grace in South Asia ''Slumdog Millionaire'' costume South Asian garment South Asian garment Sad-sounding attire South Asian garment South Asian wrap South Asian wrap Sputnik launcher, briefly Superpower until '91 Something worn in Amritsar indeed! Shaadi garment Stalin's fed Setting of the first Tintin comic Stalin's domain South Asian garment Space Race competitor Space Race contender SALT I participant Shortening Space Race inits Shortening stuff Signer of the SALT agreements Semisolid fat Shortening, perhaps Soap ingredient Solidified fat Space Race inits Setting of the 1942 book 'Behind the Urals' Setting of several Solzhenitsyn novels Setting of HBO's 'Chernobyl' Some shortening Suet component Second country to develop the atom bomb Substance in some piecrusts Swine fat Sov. Union Some shortening Suet component