KYIV, Feb 17 - British Foreign Secretary Liz Truss and her counterparts in Poland and Ukraine issued a joint statement on Thursday saying that the three nations would be developing a "trilateral memorandum of co-operation" to support Ukraine and combat Russian aggression amid rising tensions between the two Eastern European nations.

"This will demonstrate our commitment to further strengthening the strategic cooperation and engagement between our 3 nations on the highest priority issues in support of Ukraine," the three said.