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| Mr Putin and Mr Erdogan shook hands warmly after months of angry rhetoric |
The leaders of Russia and Turkey have patched up a damaging quarrel, pledging to restore close economic relations.
"The priority is to get back to the pre-crisis level of co-operation," he told Turkish President Recep Tayyip Erdogan in St Petersburg.
Their relations soured last November when Turkey shot down a Russian bomber on the Syrian border. It is Mr Erdogan's first foreign visit since an attempted coup last month. He has since launched a far-reaching purge of the armed forces and other state institutions.
Speaking in St Petersburg Mr Erdogan thanked Mr Putin, saying a call from the Russian leader after the coup "meant a lot psychologically". He said "the Moscow-Ankara friendship axis will be restored".
The war of words over the downed Russian jet delivered a big blow to trade. Turkey's exports to Russia in the first half of this year fell to $737m (£567m) - a 60.5% slump compared to the same period last year, Turkey's Daily Sabah reported.
The dispute put two major joint energy projects on hold - the TurkStream gas pipeline across the Black Sea and the Akkuyu nuclear plant being built by Russia's Rosatom in Turkey.
Russia halts Turkey gas project talks
In St Petersburg both leaders pledged to restart those projects. Akkuyu will benefit from being designated a "strategic investment", Mr Erdogan said.
Before the dispute, Russia was a major export market for Turkish fruit and vegetables - so now Turkey is anxious to get the Russian import ban lifted.