By Gabriel Stargardter and Rodrigo Viga GaierRIO DE JANEIRO (Reuters) - Brazil bowed to U. pressure and declined an Iranian request for two of its warships to dock in Rio de Janeiro at a time when Brazilian President Luiz Inacio Lula da Silva was planning his trip to Washington to meet U. sanctions on Iran and has declined to choose sides in the Russia-Ukraine war, saying Brazil is neutral and wants dialogue to reach peace