BRASILIA (AFP) - Iranian President Mahmud Ahmadinejad said late Monday that US and Israeli military threats against Iran were a thing of the past, and that, in any case, they dont have the courage to attack Iran. The age of military attacks is over, now weve reached the time for dialogue and understanding. Weapons and threats are a thing of the past, the Iranian told a joint Press conference with Brazilian President Luiz Inacio Lula da Silva, closing his one-day visit. Fielding a question on whether he feared an attack from Israel or the US, Ahmadinejad said armed confrontation was no longer a possibility. Thats clear even for mentally challenged people, he said with a smile. Besides, he added, Those you mention (Israel and United States) dont have the courage to attack Iran. Theyre not even thinking about it. Ahmadinejad met for three hours with Lula to discuss Irans nuclear programme, over which Lula reiterated his support and urged Teheran to find a just solution with Western powers. On Tuesday, Ahmadinejad arrived in Bolivia for a short visit, the second leg of a Latin America tour of three leftist nations sympathetic to his administration. President Evo Morales greeted Ahmadinejad at the airport with full military honors, later accompanying him into the center of La Paz. Earlier, a senior Iranian military official said Iran can take legal action if Russia refuses to fulfil its commitments to deliver an advanced missile defence system to the Islamic Republic. Iranian officials have voiced growing irritation at Russias failure so far to supply the S-300 missile system, which Israel and the US do not want Tehran to have. The Russians, surely under the pressure of the Zionist lobby and America, refuse to fulfil their commitments, the official IRNA news agency quoted Brig General Hassan Mansourian as saying. And because this is an official agreement it can be pursued through international legal bodies, said Mansourian, who is deputy head of Irans air defences. The truck-mounted S-300PMU1, known in the West as the SA-20, can shoot down cruise missiles and aircraft. It can fire at targets up to 150km away. Iranian officials say the country can produce a S-300-style system by itself, if The head of Irans Atomic Energy Organisation said on Tuesday that work on Bushehr was progressing as planned. The West is trying to harm our relations with Russia ... the reactor is progressing based on our agreements and Russia is doing more than it should. The Bushehr plant will be inaugurated in 2010, ILNA news agency quoted Ali Akbar Salehi as saying. Iran could consider sending its low-enriched uranium abroad, the Foreign Ministry said, signalling a possible softening of its opposition to a plan aimed at easing Western concern over its N-ambitions. Foreign Ministry spokesman Ramin Mehmanparast said Iran was not opposed to sending LEU abroad as long as it had 100pc guarantees of receiving refined fuel in return, for use in a medical research reactor. Regarding the guarantees we are not going to suggest anything, but one ... could be exchanging it on Iranian soil, Mehmanparast told a news conference in Tehran. Nobody in Iran ever said that we are against sending 3.5 per cent-enriched uranium abroad. We talked about the process of dispatching fuel, Mehmanparast said. If we say we are looking for 100pc guarantees, it means that we want 3.5pc enriched uranium to be sent out under such circumstances that we make sure that we will receive the 20pc fuel.