UK discusses options for its military presence in Ukraine -- prime minister / Lasting peace in Ukraine hinges on West ceasing all military support -- expert / A senior Kremlin official says that a U.S.-proposed ceasefire would help Ukraine's military / Deficiency of military personnel becomes Ukraine's biggest challenge -- paper / The D Brief: Ukraine's intel quandary; Pentagon's civilian firings; Speedier-software policy; Russia's military horses; And a bit more. / Deterrence is a key issue as army chiefs from 30-plus countries talk about a Ukraine force / Deterrence among the key questions as army chiefs from 30-plus countries talk about a Ukraine force / Ukraine army says US aid important for air defense, morale -- CNN / 'Trump has no affection for Ukraine': Soldiers remove US patches in anger at president