LONDON (Reuters) – Britain and Lithuania signed a joint declaration on Monday to boost defence and security collaboration, stepping up London’s support of nations that fear Russian President Vladimir Putin will not stop at Ukraine in trying to redraw Europe’s borders. Since Russia invaded Ukraine on Feb. 24, Baltic states such as Lithuania, a NATO member and former Soviet state, have become increasingly concerned they could be next to face Russian aggression. Britain said the declaration would build on the defence cooperation the countries share as NATO allies and would increase resistance to …