Washington warns 'we can shut down the Turkish economy if we need to,' as UN says over 100,000 displaced since launch of offensive against Kurds

Buildup includes Patriot batteries, THAAD ballistic missile interception system and two fighter squadrons following attack on oil plant blamed on Iran

Patriot missile battery and ground-based radar systems to bolster kingdom's defenses after September 14 attack on oil facilities blamed on Iran

After briefing Trump, Mark Esper says America and its allies will 'defend the international rules-based order that is being undermined by Iran'

Administratiion provides no further details; US officials have said there are indications that the CIA conducted the strike

Mark Esper says Trump's 'maximum pressure' campaign aimed at compelling Tehran to negotiate a new deal that would prevent it from having nuclear weapons 'forever'

PM thanks British counterpart for fighting anti-Semitism, leaves 10 Downing Street, in turmoil over Brexit, after merely 30 minutes; also set to meet US defense chief

A day after Tehran announces further violation of nuclear deal, and with Trump saying meeting with Rouhani is 'possible,' PM urges increased pressure on regime

PM to discuss efforts to 'rebuff Iran's terrorism and aggression' with embattled counterpart Boris Johnson; will also powwow with new US defense chief

Mark Esper confirms reports Osama bin Laden's 15th son and heir as head of jihadist group was killed in the past two years in US-aided operation