According to a source at the German Foreign Ministry, the visit of Heiko Maas "was on the agenda" after the Russian Foreign Minister invited him to Moscow last autumn.

Russian Foreign Minister Sergei Lavrov is holding a joint press conference with his German counterpart Heiko Maas in Moscow.
The foreign ministers are expected to discuss the future of the Intermediate-Range Nuclear Forces (INF) Treaty, Russia's membership in the Council of Europe, the situation in the Sea of Azov and Syria.
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 Source: sputniknews.com