Russia warned Britain on Monday that if British weapons were used by Ukraine to strike Russian territory then Moscow could hit back at British military installations and equipment both inside Ukraine and elsewhere. Russia said British Ambassador Nigel Casey was summoned to the foreign ministry for a formal protest after Foreign Secretary David Cameron said last week that Ukraine had the right to use British weapons to strike Russia. Russia's foreign ministry said the Cameron remarks recognised that Britain was now de facto a part of the conflict and contradicted an earlier assurance that long-range weapons given to Ukraine would...