Israel's parliament has passed a bill setting stringent new conditions before any withdrawal from the Golan Heights or East Jerusalem.
The bill requires a two-thirds majority in the Knesset before any withdrawal could be approved.
Failing that, the proposal would be subject to a national referendum. Analysts say the move could complicate peace efforts by making it more difficult for any Israeli government to make territorial withdrawals.
The bill - passed by a 65-33 majority - was backed of Israeli Prime Minister Benjamin Netanyahu who said it would prevent "irresponsible agreements".
Likud Party MP Yariv Levin, who proposed the bill, said it was of "the utmost national importance for retaining the unity of the people".
Israel considers the Golan Heights and East Jerusalem to be under its sovereignty, although Syria claims the Golan Heights and the Palestinians claim East Jerusalem.
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