Rubuta ci gaba don wannan sakin layi - Kęstutis ya yi amfani da sojoji daban-daban da kuma hanyoyin diflomasiyya a cikin 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 yakin Poland da 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 da taimakon soja ga Masarautar Hungary, a 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.