By Sabine Siebold, Jan Lopatka and Michel Rose PRAGUE (Reuters) – European Union leaders on Friday agreed to give more financial and military aid to Ukraine, but a full day of talks in Prague’s ornate royal castle seemed to bring them no closer to deciding on whether or how to cap gas prices. Most of the EU’s 27 countries want a cap on gas prices, but disagree on the details, with options including a cap on all gas, a “dynamic corridor”, a price ceiling on gas used for power generation specifically or on Russian gas only. The EU has been discussing the matter for weeks, so far without result, …