The balance of power in the Middle East has changed, a top US official said Thursday, alluding to the killing of multiple Iran-backed militia leaders over the last year.National Security Advisor Jake Sullivan said the shifts were not the way the leaders of Hamas, Lebanese Hezbollah, or Tehran had planned.For all the latest headlines, follow our Google News channel online or via the app.“We are now faced with a dramatically reshaped Middle East in which Israel is stronger, Iran is weaker, its proxies decimated, and a ceasefire that is new and will be lasting in Lebanon that ensures Israel’s security over the long term,” Sullivan said.He said the purpose of his visit was to ensure that the US-brokered ceasefire that put an end to a yearlong war between Hezbollah and Israel “sticks and is fully enforced.”Despite hundreds of violations of the ceasefire by Israel, US officials have said the truce is holding. Hezbollah has attacked Israeli forces once since the deal was agreed on Nov. 27.As