Kammala jumla mai zuwa: Kęstutis ya yi amfani da sojoji daban-daban da kuma hanyoyin diflomasiyya a gwagwarmayarsa a kan iyakokin yammacin Grand Duchy na Lithuania. A cikin 1349, don kauce wa ƙarin rikice-rikice tare da Teutonic Order, ya fara tattaunawa da Paparoma Clement VI don Kiristancin Lithuania, yana karɓar alkawuran kambi na sarauta a gare shi da 'ya'yansa maza. Algirdas da yardar rai ya kasance a gefe na kasuwanci kuma ya damu da tsari a ɓangaren Ruthenian na jihar. Matsakanci a cikin tattaunawar, Sarkin Poland Casimir III, ya kai hari ba zato ba tsammani a kan Volhynia da Brest a watan Oktoba 1349 wanda ya lalata shirin Kęstutis. A lokacin da
Yaƙin Poland-Lithuania don Volhynia, Sarki Louis I na Hungary ya kulla yarjejeniyar zaman lafiya tare da Kęstutis a ranar 15 ga Agusta 1351, wanda Kęstutis ya wajabta kansa ya karɓi Kiristanci kuma ya ba Masarautar Hungary taimakon soja, don musayar kambi na sarauta. An amince da yarjejeniyar tare da al'adar arna ta Kęstutis don shawo kan ɗayan ɓangaren. A zahiri, Kęstutis ba shi da niyyar bin yarjejeniyar kuma ya gudu a kan hanyarsu ta zuwa Buda.