This stops the latter and creates a threat in return.
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. f1e2  6... e7e5  7. d4b3  7... f8e7  8. c1e3  8... c8e6  9. c3d5  9... b8d7  10. d1d3 There was a burst of popularity in this line four years back. Even the world champion gave it a try in a couple of games. 10... e6d5 The most natural choice and the main line. 11. e4d5  11... a8c8  12. e1c1 Sacrificing a pawn. 12... d7b6  13. c1b1  13... e8g8 Which Saric decided to reject. 14. e2f3  14... b6c4  15. e3c1 [#] 15... d8d7  16. h2h3 Preparing not only g2-g4, but often threatening with Bf3-g4!