Russia's Foreign Minister has warned his American counterpart that fresh sanctions against Moscow could damage relations between the two countries 'for a long time'. Sergei Lavrov made the comments to John Kerry during a phone call amid growing concerns for Russia's crisis-hit economy. It came as a spokesman revealed Russian President Vladimir Putin has invited North Korean Leader Kim Jong-un to Moscow for the 70th anniversary of the Soviet defeat of Nazi Germany in World War Two. Defiant: Russian President Vladimir Putin accused the West of building a 'virtual' Berlin Wall to contain Russia Phone threat: Russian Foreign Minister Sergei Lavrov, left, told his American counterpart John Kerry, right, that further sanctions against Moscow could damage relations 'for a long time'
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Russia's foreign minister warns US counterpart John Kerry over the phone
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Moscow under pressure as rouble collapses and stock market plummets
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New US law gives Obama the power to impose sanctions if he so chooses
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Analysts believe they would be aimed at Russia's defence industry
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EU bans investment and tourism in the disputed Crimea
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Follows Vladimir Putin's defiant stance at  press conference
It would be @placeholder's first foreign visit since taking the helm of the reclusive east Asian state in 2011.
Tourism services are also banned, with cruise ships barred from @placeholder ports, except in an emergency.
But Putin said he felt the 'support of the @placeholder people', though he had not decided yet whether to seek a new six-year term in an election due in 2018.