Herzliya, Israel

TODAY, as American, European, Russian and United Nations officials meet in Washington to discuss the future of the Middle East peace process, Israel’s prime minister, Benjamin Netanyahu, remains adamant that a peace deal premised on returning to Israel’s pre-1967 borders poses an unacceptable risk to its security.

He is right: the country’s 1967 borders are not militarily defensible. But his use of this argument to reject the only viable formula for Israeli-Palestinian peace — a negotiated two-state solution based on mutually agreed upon land swaps — is wrong, and it does not serve Israel’s security interests.

Israel needs peace with the Palestinians, and that will likely require a return to the 1967 lines with a few adjustments. These borders can be made defensible if they come with a security package consisting of a joint Israeli-Palestinian security force along the West Bank’s border with Jordan, a demilitarized Palestinian state and a three-way Israeli-Jordanian-Palestinian defense treaty. Combined with such a package, the balanced formula President Obama outlined in his May 19 speech can give Israel the security it needs and deserves.

Until June 1967, Israelis feared that a swift Arab military move could cut Israel in two at its “narrow waist” — an area near the city of Netanya, where the country is less than 10 miles wide. By doing so, Arab tanks and artillery could have reached Tel Aviv within a few hours. In the 44 years since, the geography has not changed, but the threat has.