Well keep on asking him and maybe in the end you will understand that he has no answer for that question. On the other hand you can drop the question and continue with his charade. It is really up to the US, because this time around they understand that the Israelis are stalling in order to have the US leave it up to the Israelis to "negotiate" with the Palestinians":"Israel is conducting the proximity talks very thoroughly, on a variety of issues, in order to move as quickly as possible to direct talks."
Russia says kills six suspected militants in North Caucasus (Reuters)
from the article: U.S. frustrated with Netanyahu over stalled proximity talks