MOSCOW  Russia will loan Venezuela $1 billion for arms purchases and military development, a Kremlin spokesman said Friday, the second day of a visit here by President Hugo Chávez aimed at tightening a relationship that has caused increasing discomfort in the West.

Mr. Chávez , who is on his second visit to Russia in two months, met with Prime Minister Vladimir V. Putin on Thursday, and on Friday traveled to the southern city of Orenburg near the border with Kazakhstan to meet with President Dmitri A. Medvedev.

A Kremlin statement released Thursday night said Mr. Putin and Mr. Chávez had spoken on enhancing economic cooperation and trade in commercial goods as well as military technologies.

The $1 billion loan will help finance programs related to military-technical cooperation, the statement said. The Kremlin spokesman, who spoke anonymously under normal diplomatic ground rules, would not elaborate on the details of the deal.