Indonesia and Russia pledged today to strengthen cooperation in cyber-security and counter-terrorism as concern grows about the spread of radicalism in Southeast Asia. <br/><br/>Russian Foreign Minister Sergei Lavrov, who is on a two-day visit to Indonesia, said the two countries would work together more closely to counter the spread of Islamic State (IS) ideology. <br/><br/>Lavrov said, the threat that the IS is, has not vanished. He said, its members have been spreading all over the world, including areas close to the Russian and Indonesian borders. Indonesian officials have also said dozens of Indonesians have travelled to the southern Philippine city of Marawi to fight with terrorists loyal to IS. <br/><br/>The terrorists seized parts of the city over two months ago and have resisted all attempts by the Philippine army to evict them. <br/><br/>Indonesian Foreign Minister Retno Marsudi said the two countries had strong ties on political and defence issues, and Indonesia wanted to deepen trade ties.<br/><br/>The ministers also discussed tensions on the Korean peninsula, the South China Sea and conflict in the West Asia, but gave no details.