Vladimir Putin was greeted with a display of a Ukrainian flag while visiting Kazakhstan for a summit where he is expected to discuss the war in Ukraine.

Ukraine's flag - with its horizontal bands of blue and yellow - briefly appeared late on Wednesday instead of the Russian white, blue and red tricolor on a screen located on one of Astana's main thoroughfares.

By Lidia Kelly and Tamara Vaal ASTANA (Reuters) -Russian President Vladimir Putin visited Kazakhstan on Wednesday, and discussed boosting energy and industry ties and easing a row over farm goods with the Central Asian nation which exports most of its oil through Russia but is exploring alternatives.

President Vladimir Putin warned that his forces could strike “decision-making centers” in the Ukrainian capital of Kyiv with new ballistic missiles as retaliation for attacks on Russia using Western missiles.

Russian President Vladimir Putin has threatened to attack decision-making centres in the Ukrainian capital of Kyiv with the country's new ballistic missile, Oreshnik. Putin was sp