ATHENS — Greece, in a sign of how volatility in the Middle East is subtly reshaping the defense postures of some regional players, has announced that preparations have begun to build an Israeli-style Iron Dome air defense system.

Speaking to the Greek Skai television network this week, the deputy defense minister, Yiannis Kefalogiannis, said that the Greek “iron dome” will be operational by 2026. Mr. Kefalogiannis said that preparations for the all-weather missile shield, to be modeled after Israel’s successful Iron Dome systems, have started “at the level of discussions, regarding the specifications, and the corresponding tender procedures will follow.”