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Instead, they are sown with “dragons’ teeth,” concrete antitank barriers typically bound together with cables and threaded with razor wire.

So far, though, the Pentagon has identified a potential danger only in a few unusual circumstances, like firing powerful antitank weapons or an abnormally high number of artillery shells.

In flat green fields less than half an hour to the east, though, crews scatter pyramid-shaped reinforced cement antitank obstacles known as “dragon’s teeth.”

In one Israeli border town, antitank missiles fired from Lebanon have damaged scores of homes.

Mr. Trump’s allies also point out that he approved sending antitank weapons to Ukraine, which President Obama had not done after Russia seized Crimea in 2014.