BUDAPEST, Feb 16 (Reuters) - Hungary and Slovakia have asked Croatia to help to deliver Russian oil, Hungary's foreign minister said on Monday, after disruption to flows via Ukraine and conflicting accusations of blame.

The authorities say a growing number of citizens are being illegally recruited to fight elsewhere.

Volodymyr Zelenskyy says intelligence suggests Russia is preparing a "massive strike". Meanwhile, Kyiv's negotiating team has left for trilateral talks in Geneva with the US and Russia, as the Kremlin rejects accusations it poisoned Alexei Navalny.

Ukrainian President Volodymyr Zelenskyy has accused the U.S. of focusing on Ukrainian concessions to bring an end to the war, rather than pressing Russia.

Hopes of success remain low after Trump points finger at Zelenskyy and as Russia keeps up hardline demands

A security source told Business Insider that the drones struck a refinery in Russia's Komi Republic on Thursday.

A former Ukrainian energy minister has become a suspect in a far-reaching corruption investigation that shook the administration of President Volodymyr Zelenskiy and forced out his top aide last year.

Ukrainian authorities detained former energy minister Herman Halushchenko in the Operation Midas probe investigating alleged $100 million kickbacks.