The British government has indicated its readiness to allow Argentine companies to take part in the development of oilfields in the Falkland islands' territorial waters- provided they acknowledge that any oil extracted belongs to Britain.
The British government has made deals with the government of Brazil. 
The passage focuses on Argentine companies, not Brazil so there is no way to know what it has done with Brazil. 
( z0 deal :ARG0 ( z1 government-organization :ARG0-of ( z2 govern :ARG1 ( z3 country :name ( z4 name :op "Britain" ) ) ) ) :ARG1 ( z5 government-organization :ARG0-of ( z6 govern :ARG1 ( z7 country :name ( z8 name :op "Brazil" ) ) ) ) )
(z0 / deal-01
    :ARG0 (z1 / government-organization
              :ARG0-of (z2 / govern-01
                           :ARG1 (z3 / country
                                     :name (z4 / name
                                               :op1 "Britain"))))
    :ARG1 (z5 / government-organization
              :ARG0-of (z6 / govern-01
                           :ARG1 (z7 / country
                                     :name (z8 / name
                                               :op1 "Brazil")))))
The British government has made deals with the government of Brazil .
z3 :name z4
z4 :op1 1
z1 :ARG0-of z2
z2 :ARG1 z3
z0 :ARG0 z1
z0 :ARG1 z5
z5 :ARG0-of z6
z6 :ARG1 z7
z7 :name z8
z8 :op1 0