ISTANBUL, April 5 - President Tayyip Erdogan said on Friday Turkey was continuing to make payments under its deal with Russia to buy S-400 missile defense systems and the United States had not presented the same terms when it offered to sell Patriot missiles. 'The S-400 holds an important place in our talks. The United States' arguments are very wrong. We finished the S-400 process and our payments continue,' Erdogan told reporters in Istanbul when asked about his planned talks in Moscow next week.