An Israeli law which allowed ultra-Orthodox Jews to defer military service is to expire on Tuesday, leaving a legislative hole which could technically see them called up en masse.
When the Tal Law expires at midnight, conscription will theoretically be guided by a 1986 law, meaning that all 18-year-old Israelis, including the ultra-Orthodox, will be compelled to enlist -- unless they are specifically exempted by the defence ministry.
However, Defence Minister Ehud Barak on Tuesday afternoon gave the military some breathing space to work out how to put the theory into practice.
"Barak has instructed the Israel Defence Forces to submit, within about a month, a practical proposal for implementation of the Security Service Law on the youth of the ultra-Orthodox community," a statement from his office said.
"This is until the Knesset (parliament) approves new legislation regularising the issue permanently."
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But the question of how to reword the law has sparked deep divisions in the rightwing coalition of Prime Minister Benjamin Netanyahu, which failed to push through new legislation before the parliament broke up for its summer recess.
The centre-right Kadima party pulled out of Netanyahu's ruling coalition two weeks ago, just 70 days after joining it, saying his draft legislation did not go far enough.
Party leader Shaul Mofaz said he was pulling out over Netanyahu's refusal to accept the conclusions of a committee headed by Kadima MP Yohanan Plessner.
The departure of the 28-seat party, the largest in the 120-seat parliament, reduced Netanyahu's overwhelming majority of 94 to 66 MPs.
Israel's Arab youth have traditionally been exempted from military or national service by means of an unwritten Israeli policy.
But when parliament reconvenes in October after its summer break, attempts to push through fresh legislation compelling both Arabs and the ultra-Orthodox to complete some form of service, are likely to begin again in earnest.