london nato must take concrete steps to resolve the migrant crisis on the belarus border polish pm mateusz morawiecki was quoted as saying on sunday adding that poland lithuania and latvia may ask for consultations under article 4 of the alliances treaty under article 4 any ally can request consultations whenever in the opinion of any of them their territorial integrity political independence or security is threatened it is not enough just for us to publicly express our concern now we need concrete steps and the commitment of the entire alliance morawiecki told polish staterun news agency pap russian president vladimir putin a key backer of belarus leader alexander lukashenko said that russia was ready to help resolve the crisis ria news agency reported morawiecki told pap that eu leaders would discuss further sanctions against belarus including completely closing the border