Sybiha expressed his gratitude in posts on X, Ukrinform reports.
"Estonia once again shows what true friendship and leadership mean: standing with Ukraine when it matters most. Together, we will prevail over Russia's terror," Sybiha said.
Addressing Moldova's partners, he noted that Russia's deliberate attacks on Ukrainian ports and trade routes make alternative export routes vital to Ukraine's resilience and global food security.
"Moldova's decision to facilitate the transit of Ukrainian agricultural goods through Solidarity Lanes is an important and timely contribution. We highly value this practical support and Moldova's true solidarity with Ukraine," Sybiha said.
Read also:Ukraine, Romania to expand alternative logistics routes for agricultural exports
Earlier, Estonia's Ministry of Foreign Affairs said the country had allocated EUR 340,000 to help Ukraine prepare for the winter.
The Ukrainian and Moldovan prime ministers agreed on a 50% discount on rail transit rates for Ukrainian cargo. The new arrangement will be in effect from August 10 through the end of 2026.
Moldovan Prime Minister Vasile Tofan said that up to 600,000 tonnes of Ukrainian agricultural products would be transported through Moldova's railway network by the end of 2026.